Will also mention as others, that there are often available resources with space. Schools, libraries, churches, community some times fire stations have a room available to the public. Sometimes free/sometimes small charges.
I don't get up and down off the floor any more without an exit strategy... In the old house, my bed was my largest available space, I didn't have that much floor space available except in the kitchen. Bed height not good for work surface, but better than floor... You can use rolls of heavy brown paper to stabilize/protect the bed surface, or flattened cardboard boxes.
If you have outdoor space, I got a free foldable ping pong table at the old house. Finish was bad for ping pong but fine for my needs. True, I could only use on dry non-windy days but a great height and size for quilting projects.