I moved into a flat two years ago. Had lived in houses since 1964. Okay just me. Firstly, I did look at ground floor garden flats, but felt that for feelings of total security would prefer to go to a first floor one. Found one, with a large patio/balcony, where I can sit in good weather, etc. No problem re gardening, as it has room for several pots and I mix faux and real flowers in these, so it is very colourful.
Very large Living/dining Room, and separate kitchen, two bedrooms, two bathrooms. Obviously, block has a lift, although being on first floor, I try to use the stairs if I am not carrying anything heavy.
I can only say how much I absolutely love living all on the one level and having the security of being on the first floor. Can pop out without having to keep closing windows. No internal stairs to be a problem. My spare bedroom gives me the opportunity to have overnight guests (and extra space for my non-current season clothes).
Being on the one level makes it so very easy to keep clean and I use all of the space. Does not matter if I forget to bring something out of my bedroom, I can pop back in there with ease. Large cupboard in the wide hallway, so ALL cleaning items live there and none under the kitchen sink or any either bathroom. Grandchildren visiting me often go into the spare bedroom to chat amongst themselves, leaving the adults in the Living Room.
I have a garage on the ground floor, which takes my car and my mobility scooter. When I come home from weekly supermarket shop, my bags go into a wheeled trolley in that garage and that is easily wheeled up (via lift) to my flat. Much easier than carrying bags from car to kitchen as I did in the house.
Although all the flats where I live are owner-occupied and all independently living, we are friendly lot. Ready to help each other as necessary and if you need a chat to someone any day, can sit in the large, pleasant entrance lobby and be sure to be able to meet up with people.
Indeed, I think houses are for when you have children. For adults only, I really cannot think of anything better than a flat.