I just returned from a 4 day trip to Paris. I haven't been back in a year due to my acquiring 2 puppies last September.
Gare du Nord is under construction, as usual. They had moved the Navigo machines. I found them, but they all had long lines. So I decided that I would top off my card at one of the smaller stations. No luck. It refused my American CC because I did not have a PIN number. Long lines at the counter. Now I know why.
I booked a very nice hotel, Hotel de Flore, on the North side of Montmartre. It was a lovely hotel with AC, but, as I discovered, being on the North side has it's drawbacks. Uphill sidewalks or lots of stairs. And I mean even in the Metro after you get off the elevator.
Google Map showed me a short cut. Which it was, except it was 120 steps straight up. I did it once.
It was HOT. Upper 80s. And crowded. Everyone was wearing shorts and tennis shoes or sundresses and sandals. I had to plan my days carefully. I would go out early to see whatever I had planned, grab lunch and head back to the hotel for a shower and a nap.
My plan had been just to wander some of the places familier to me, but I had to curtain my activities.
The heat absolutely sapped my strength. I won't be returning before November.