If you can, RENT this place. It is in absolutely the most amazing location in Rome. You can walk to anything you want to and once you're home-- you're where all the cool stuff is. It is utterly charming. And bonus- it's cool- even on the hottest days. Your host is VERY helpful with can't miss suggestions for everything from the best restaurants to the best place for coffee in the morning.
The two larger beds are in lofted spaces and are accessible via metal spiral staircases. We did just fine with them, going slowly. The single bed downstairs is perfect for those that don't want to deal with stairs.
The place has a full bathroom with amazing shower, bidet and toilet--- but it also has another half bath! Which is especially nice for a bigger family! We were also pleasantly surprised to find a washing machine!
If you are lucky enough to get this place be sure to go to all the cool places nearby- including the bar/tatoo parlor you can kind of peek into on the next street called Wisdomless. People come from all over to try the ice cream on the corner (Frigidarium) and the pizzeria on this street (montecarlo) Both totally worth it and a good price.
This is an amazing place. I've stayed all over and I highly recommend this place.