Nora and Andrej are great, they were at the apartment to receive me and my girlfriend, they explained all there was to know about the house. The apartment is good, it has all you need to stay in Prague for some days: you can cook, you can wash your clothes, you can listen to good music, the Wi-Fi connection works good. In complement to all this, there is also a bakery and a supermarket 1 minute away from home. Touristicly speaking, the location is not perfect but is good enough, you'll stay 2 minutes away from Belvedere and 20 minutes from Karlsplatz, public translation is not a problem. There is a City Bike station nearby, which makes things easier, they are really handy.
Would totally recommend and repeat it all.
Once again: Nora and Andrej are excellent hosts.