We had THE BEST time staying at Oleg's place. The housekeeper Katerina was very helpful, nice and welcoming, the whole stay was well-organized and taken care of. We are big suckers for authentic and historical experience, and staying at Oleg's place, in the very heart of the city, was a truly unique opportunity. About the stairs - I read the reviews and was ready to climb the ladder, and when I arrive - what do I see? Regular(!) steps that are not even steep! So don't let that scare you, it's a myth :)
We liked everything - the atmosphere in the house, the view out of the window and the balcony, the fact that we stayed in a historical building 2-3 min away from from restaurants, cafes, shops, public transportation and sightseeing.
All and all, we decided to come back to Prague sometime in winter and stay at Oleg's place once again. It was that good.