The apartment is even more lovely in person than it is in the pictures, so that did not disappoint. Alena was very quick to respond to messages and really helped coordinate things before our arrival. There were a few hiccups along the way though. For one, the cleaners didn't arrive until half an hour after the check in time (so there was no key available for us to get into the place) and we had to try to get on wifi somewhere so we could call the host who had to get in touch with the cleaners again. So we ended up getting in over 45 minutes after check in. Definitely not as smooth as we'd hoped. The building also has some weird quirks. The elevator is pretty sketchy - my fiance got stuck inside for almost 2 hours one evening until the maintenance people could come fix it. And the building sometimes runs out of water so the toilet doesn't always flush and you sometimes run out of water during a shower after just a minute or two.
Aside from this, the apartment is great. It's in a great location in the city, but isn't too loud. The bed is very comfortable, and the kitchen is well stocked with supplies. The host also gives you a long list of excellent recommdations for things to try nearby! These ended up being some of our favourite things we did in Prague!