We had a great stay at Petr's place. everything went really smooth. location in city is pretty great and felt safe. many great restaurants around. I wish we would have stayed more considering how lovely Prague was and how comfortable and lovely the unit was. interior was newly done. the unit was very clean and had provided all essentials.
if you are planning to arrive at main door by your can access is in restricted car access area so you will probably have a 5 minutes walk. unit was on 4th floor and elevator which starts from 1st floor (not lobby) was broken at the time and we had to take our luggage through stairs which was had considering we where tired at time of arrival. we were traveling with carry-ons and large backpacks but still was not convenient to climb up 4 levels with your belongings.
saying all that I would still very much recommend it because the pros was more than cons.