We were two couples visiting Prague together for this stay, and found the apartment worked really well for us all! Both bedrooms were roomy, and we found the common areas great to hang out together in. The high-ceiling rooms were elegant and added to the roomy feel of the place. The only tight spot was the kitchen; you could really only have one person doing something (be it dishes or cooking) at one time. The bathroom and water closet look to have been recently remodeled and look great, as well as work great. There was plenty of hot water, in fact you had to be a bit careful not to scald yourself.
The apartment was well-located for all of our explorations of Prague, and also for our arrival via train. There were many great restaurants within walking distance and the neighborhood was fine. There's some widespread construction works that has a lot of the sidewalks partially torn up, so you do have to watch your footing while walking around.
Ondrej was a great host, and really went out of his way to help us. Communication was great, so we had no issues, and don't hesitate to recommend him and his place!