I really liked the apartment. It's very close to central Prague, and its nearness to the river is definitely nice as well. Even though it's pretty small, it doesn't feel cramped but cosy - so it's a good place especially for couples ;)
We only saw Alzbeta once, when receiving the keys; she was friendly and gave us a quick 'tour' of the apartment. What was really great was that she didn't give us a limit regarding the arrival/departure time; we simply told her what would be convenient for us and she arranged it.
The only problem with the apartment was the bathroom door, which can neither be locked nor fully closed since it's a sliding door. But if you don't have intimacy problems you'll be fine.
All in all, we had a great stay there and would definitely come back!