My fiancée, two friends and I recently stayed at this apartment and we absolutely loved it.
Firstly, the pictures accurately portray the space and character of the apartment. The facilities all worked perfectly and the beds were very comfortable. The location is also great; easy to walk to cafes and restaurants, while the nearest metro and tram stations are within a few minutes' walk.
Secondly, Tereza and her friends are fantastic hosts. Check-in was easy and on time, and we received lots of useful communication in advance (e.g. recommended food/drink spots, offers for a cheap private airport transfer etc). Instructions for accessing the building and setting/switching off the alarm system were very clear, and we felt completely safe as a result. They then left us in peace to enjoy Prague, but Tereza was also quick to respond if we had a question (e.g. how we could check-out in the early hours for our flight).
I highly recommend staying here if you want to experience Prague in a small group. You will feel you have found both good value for money and a high quality apartment, as we did on our holiday.