We visited Prag as a group of four. We were very pleased with the apartment. It is in a good condition, clean, quite spacious and well equiped. Metro (ca. 10 min to the city center), supermarket and a pizzeria are just around a corner which is a big plus. There is a parking place in front of th building but it is not secured. If you need a safer option there is a secure parking behind the building within 5 min walking distance (10€/24h). The Wi-Fi was weaker at some days but overall it was enough to tune in radio and upload some fotos on Facebook :)
Katarina is a great host - very friendly, helpful, well prepared and professional. She answers all questions. A late check-in wasn't a problem.
Overall it was a great experience. I can defintely recommend this appartment. I would book it again.