Everything was great. The apartment is in the center of the big touristic spots in Prague. You can get to the Astronomical Clock and the Wenceslas Square in 5 minutes and you can take your photo at the Charles Bridge (Karls Most) in less than 10 minutes. There are plenty restaurants, shopping opportunities and the public transport nearby.
Also, the apartment was clean, comfortable and had everything you need for staying a few days. The only thing you need be aware of is that it can get a bit loud at midnight because you're staying close to a party mile. But the householder was kind enough to bring earplugs just in case (which we didn't need it at the end).
The communication with the householder was great, very fast and kind responses. I can absolutely recommend this apartment!