places to stay close to San Marco Florence

You might want to edit your question-it’s a bit confusing

I don’t have any recommendations but Santa Croce is basically in the historic center so most anywhere listed as in historic center will work.
Florence is very compact and walkable

Both the San Marco and the Santa Croce areas are fine to stay in in Florence.
It’s so easy to walk to everything you’d want to see in Florence, and when your legs get tired, there are great little electric buses that go in circular routes around the centre.

Use Booking.com or any similar search engine and select the filters you want.

As mentioned above anywhere in the historical center will work as the historical center is only 2 sq. miles and is very walkable. The historical center is the area within the perimeter once occupied by the ancient city walls, which are still in place on the south side of the Arno river, while elsewhere they have been replaced by Parisian style boulevards in the XIX century.

Sorry for the confusion, I meant Santa Croce. I also need "very close" because I'm having difficulty walking these days. And I'm heading to Florence very soon.

It’s been a number of years since we stayed in Florence. Our tour group stayed at Hotel Silla which is a 5 minute walk across the River from Santa Croce. It’s in a beautiful historical building. The hotel still has positive reviews on Booking.com. Most sights are in close range. I would suggest searching Booking.com for more options. Hope you can find accommodations to meet your needs. Enjoy your stay! https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiw2ri2wP_8AhX5AzQIHaWuDw0QFnoECBoQAQ&url=https%3A%2F%2Fwww.booking.com%2Fhotel%2Fit%2Fsilla.html&usg=AOvVaw15uhPIn5JAMVyqJ9OTEyHE

I also need "very close" because I'm having difficulty walking these
days

Railroad Lady, is there a particular reason you want to stay very close to this church (Santa Croce)? While it is definitely within the historic district, it's on the far eastern side of it. If your concern is being comfortably able to sightsee on foot, you might want something a bit more centrally located? The cathedral, for instance, is pretty much the bullseye.

But looking at some of your previous posts, I see that you've been to Florence before so maybe you already knew that. I'll assume you already know about the bus system too?

https://www.visitflorence.com/moving-around-florence/by-bus.html

Yes, I've been to Florence many times but I've never spent some time just concentrating on the Santa Croce area. I've always just breezed in and then breezed out so I'd like to spend a few days there. Then I have reservations to stay in the Oltrano area.
I've never used the bus system in Florence but this may be the time to try it out.

I cannot say enough good things about the little electric buses in Florence --- they go everywhere and will save you a lot of walking time. I used them almost daily for 5 weeks. Our apartment (which I would have highly recommended to you but it's up a few flights of stairs) was just a few steps from the Piazza Beccaria bus stop. The wonderful host of this apartment has a second similar one in the same building (a building where she also lives) that is still up some stairs but not so many: https://www.airbnb.com/rooms/13244108?guests=1&adults=1&s=67&unique_share_id=7491a818-9f10-4c15-b4fc-1e56519bc53a If it's like our apartment was, it's quiet, has AC, has screens on the windows, well-equipped kitchen, is spotlessly clean, and really everything is perfect including Silvia the host, except those pesky stairs for you. See if it might work, though.

The bus went right through the piazza at Santa Croce and I was extremely happy not to be among those crowds of people. I can't remember how close it went to the Duomo, but I believe darn close. I do understand about the walking thing, having had a bad hip and foot issues for 30+ years and also, on one month-long trip to Italy, had a painful foot injury that had me using a cane up and down stairs and on cobblestoned medieval streets and even using a wheelchair in the airports.