Seine view?

Years ago we stayed at a Hilton which had a view.

While I can’t recommend a specific hotel since my Paris trip isn’t until next year, I can tell you how I research hotel locations. I use Google Maps, find Paris and the area that you want. There will be a search for hotels below the location search. When you see the hotels on the map, click on the hotel name then there will either be a link to the hotel’s website, or you can Google it. Do a tentative booking to see rooms and prices. (Don’t finish your booking unless you really want to book that hotel.). You can also use booking.com. But when location is important I find starting with Google Maps the best. I’m sure you know to book only cancellable rooms, especially in the Covid age.

Why not consider one of the trendier water views than of the Seine, like one of the canals -
that's where the current generation's equivalent of yuppies are hanging out, like here:

https://lecitizenhotel.com

One hotel is built over the water. I don’t remember the name but you can see a map on Booking.com that should have a little icon at the water’s edge, not far from Bastille.

There is the St. Christopher's Inns hostel on the canal, which is even trendier (it has a burger bar called Belushi's, for example):

https://www.st-christophers.co.uk/paris/canal-hostel?utm_source=google&utm_medium=organic&utm_campaign=gmb_canal

These are all good ideas. Thanks all. It's good to hear about actual experiences, as finding a place on an online map doesn't necessarily provide sufficient information. For others who are interested, the hotel on the water not far from the Bastille is a floating hotel called OFF Paris Seine.

For my (cancelled) trip last year I booked a room at Hotel St. Louis en 'Isle which is on an island in the middle of the Siene. I'm not sure of the view but the location was outstanding - with in walking distance of Notre Dame cathedral or crossing the bridge to get to a metro station. It got really good reviews in tripadviser and the Rick Steves Paris guidebook.

None of the 4 hotels on Ile St Louis have a Seine View. Hotel Notre Dame does, afaik, but it is the only one that is affordable imo. I’m not a fan of Canal St Martin, the canal itself or the area. But if you can afford any of the 4 excellent hotels on Ile St Louis I highly recommend them and that location. It’s my favorite and where I like staying.

I don't know what time of year you plan to travel. Historically, certain months like for example June and September have higher rtes than let's say August. That being said, unless prices change dramatically in the post-pandemic world, I think you should be able to find nice accommodations for under 300€ per night, especially if you are not traveling in peak season. In the meantime, for the view, take a look at the Hotel Notre Dame Saint-Michel. Fair Warning: let's just say that their elevator and stairs can be a challenge with luggage.

Thanks JHK. The Hotel Notre Dame Saint-Michel is a good possibility. I don't have set travel plans or dates yet--I'm just dreaming and planning for the post-Covid possibilities. I have been looking at staying in Paris for a week before a RS "Loire and the South of France" tour, and would sign up for a spring or fall tour as the heat is an issue for me. So that timing should work in my favor.