Paris with my elderly Mum

How wonderful. I know it will mean a lot to both of you. What is your budget?

It's Paris, so a lot more than I expect! I am trying to stay within the $6000 for a week range.

Sounds like you're planning a great trip for her.

Given your list of places to see, I would look for something in the 6th or the 7th on the edge of the 6th.

Your train to Chartres will depart Gare Montparnasse. It is in the 7th along with Musee d'Orsay and Luxembourg Gardens.

If this is a May to September trip, be sure your apartment has air conditioning.

I laughed at your "It will PROBABLY be her last trip to Europe". What a woman.

I took my parents on a trip that included Paris when they were in their early 80s, but my dad had ankle problems so couldn't walk very far. We stayed in the 6th. We walked some, and took cabs when my dad couldn't walk any further. We must have occasionally taken the Metro, because one of my mom's must-see's was the Coulee Verte. We happened to be in Paris on (U.S.) Mother's Day, so it was a special day for us both. We had a picnic lunch (picked up beforehand), which we ate at a bench amongst the greenery.

The plus to a hotel, where she can go back and rest as needed, is that if you need help with anything, the hotel staff is there for you.

It will be such a special trip for you and your mum!

For Chartres you should plan to spend a night so you can see the illuminations. you could stow luggage in Paris and just take an overnight bag -- the Cathedral is an easy stroll from the train in Chartres. If you do this plan to have dinner here:
https://restaurant-moulin-ponceau.fr/en/

It will be a grand time I am sure. We are going the second week of April, so hopefully there will be plenty of flora blooming. And we will be sure to pack our rain jackets as well! I have been in touch with a few apartment services and they are all lovely, and expensive but I am a bit put off by Booking.

I suppose I am concerned about the business of the Latin Quarter and Halle, but I want her to be able to sit and watch from her window with a glass of wine when she does decide to rest.

I guess I will take any advice for traveling with elderly parents in a foreign country, thanks.

Paris is just très magnifique!

All areas of Paris have pockets of calm and pockets of busyness. If you can provide an approximate location of the apartments you're considering (nearest intersection, for example) someone here will probably be familiar with the neighborhood.

Last year, spring came early to Paris and the gardens were beautiful in early April.

Lucky Mom and lucky you to have such a vibrant mother at 93! i believe your husband also deserves a pat on the back. We like to stay in apartments because of the roominess, washing machine and ability to sit in a living room, etc. Guest Apartment Services is something you might want to check. We will be staying with them again in June. Our Tulip Apartment (On Île-Saint-Louis) with GAS was large and lovely. We're trying a new area--at the tip of Île de la Cité. GAS has a concierge service that is very helpful if you choose to use that.
One of the lovely things about Paris is you can go to a cafe to just sit with a cup/glass of something if you're tired--you don't even need to return "home".
I hope you'll return to the forum to let us know how it went.

Sounds absolutely wonderful! What a great son/daughter you are.
I would recommend staying very close to the Luxembourg Gardens in the 6th arrondissement, so you both can easily spend time in the park. It’s beautiful, a great place to rest but still feel you are in Paris and surrounded by Parisians. It has two cafés, two crêpe stands, and three restrooms, with lots of benches and very comfortable chairs that you can move to where you want.

I use Booking.com wherever i go to find what i’m looking for in a hotel, apartment, or house.

I am disabled, so i take taxis a lot. If taxis appeal to you, download the G7 app so you can get one when you need it. It is very hard to flag down of taxi in Paris.. I also often take a bus when it’s convenient.

It can rain a lot in April, so be prepared for that.
Have a wonderful time!

We are in Paris now. Look for our reports from France.

Do not plan on the Metro. We are 73 and 77 and it's killing us - up the stairs, down the stairs, yada yada.

Don't wait until June. Go in April. Already in January, some museums are crowded - Orsay was ridiculous. Also be VERY careful about the online options for tickets. They don't give you the full options. See my post "Report from Paris".

When you get your apartment, make sure it is legal - Paris is not happy with AirBnB. Also note that elevators are not always available in every building. Make sure there is an elevator.

Paul of the Frozen North was apparently speaking of a website for the Orsay that was not the official one. Pay close attention to the ones you are on. See the responses to his entry.

Thank you everyone for your suggestions and help. I have chosen an apartment on Bd Saint-Michel. It is very close to everything and a bus line just out front. Mum is VERY excited to say the least!