I recently stayed at Jiri's place for a month after coming to Prague for work.
Firstly, I'd say the location of the house is great - loads of great restaurants (try the burgers and the Czech food restaurants that are walking distance) and two supermarkets, as well as many tram and bus stops close by.
Additionally, the house is sparkling clean and has a well equipped kitchen and a washing machine, which was great as I was staying there for sort of a long time.
Jiri and Marek were also very helpful and welcoming.
Would definitely recommend the place!