The flat is clean and the location is great, but the kitchen is not fully equipped. There's enough cutlery, but no toaster, macchinetta, or coffee machine.
Dining table is OK, but chairs are of the folding type.
Acoustics are not great, so you can hear the neighbours "talk" at 04:30.
The team was great and helpful, but they should really consider salf check-in via door code or key box. Checking in at the office reminded me of 90's, pre-AirBNB short-let flats.
On the other hand, having an office means you have a real person you can talk to, that may help you solve a problem or find a taxi to the airport, so that's a plus.
All-in-all, the flat is an OK value-for-money place for a couple of days in Prague.