Great for what we needed - slept the four of us pretty comfortably (there’s a decent amount of stooping because of the ceilings). Amazing location really close to the train station and all of the key tourist places. Mike recommended a couple of restaurants that were great, as others have said.
Couple things to know - you’ll need to buy bottled water to drink, as there are lead pipes in the building. The supermarket is very close, though. Also, it’s on the fifth floor and the elevator is tiny. So if you’re at all claustrophobic, get ready to do some stairs. If you’re mostly going to be out-and-about, you’ll have plenty of space; the kitchen is snug.
That said, it’s a great value for the location and we had a lovely stay. Great for tourists to Prague.