This place is really nice (as you see on pictures which are very accurate). What was not depicted is that the building itself has internal courtyard with benches and tables where you can stay late, sip beer (there is groucery shop just at corner of the street), smoke, browse the Internet or work (WiFi speed is very good).
The location is great - centre of historical Prague, but more quiet and peaceful. There is nice park just next to it with parading peacocks (actually you can hear them from the apartment)! It's really convenient location if you want to visit castles, galleries etc. Kafka Museum is just around.
I highly recommend it :)