In short : Excellent.
Longer Story : We (3M, all 50 yrs old) have rented the apartment for a long weekend to visit Prague. Apartment is wonderful. It has everything you would need. It is extremely spacious, well equipped, good showers, enough beds for up to 6/7 persons, close to the metro/underground and trams to get to the city center, if required as walking to old town quarter will not take more than 15 minutes.
Host is very friendly, gives all information well in advance, arranges for a taxi (if needed) and even allowed us to keep our luggage stored after check out.
An absolute recommendation if you would visit Prague.