Unfortunately I was not able to be Alex's guest personally. My recommendation is based on my parents and their friends' experience while staying in Prague:
We highly recommend Alex's apartment. As described in a tittle, the apartment is really stylish and it is located in the very center of Prague (close to the main tourist attractions as well as restaurants and supermarket) indeed.
We had no problem finding it. It was very clean and well equipped.
It's like a cherry on the cake while staying in the City of a Hundred Spires. We had absolutely perfect time in Prague and we hope to come back soon (and stay in Alex's place of course :) ).
Do not hesitate to book this offer!