This review is in two parts – the apartment and the building.
The apartment is great, quiet, spacious (by New York City standards, anyway) and well-appointed, including a washer and dishwasher. It is on the 4th floor (5th in American terms), which was fine as long as the elevator worked (see below). Very nice bathroom with overhead shower, but we would advise bringing a non-slip bathmat – the tiles can be slippery. The large smart TV is a nice touch, though the channels received are inconsistent. The wireless (and wired) connection worked well. The area is great, away from the city center, but a block from the #6 tram, which goes all over Prague, and only a few blocks from I.P. Pavlova metro and tram station, with the #22 tram to the castle. Lots of restaurants, at much better prices than the city center. The apartment owner is Prague Days, a company that owns a number of apartments, and they were extremely responsive and helpful, though they couldn’t always help with issues in the building. Note: only one set of keys is provided. If you want another, let them know in advance and be prepared to pay extra.
The building has some problems, though. Four days after we arrived, the elevator broke down. Prague Days was unaware of the ongoing elevator issues, but a neighbor said it happened all the time and could take a week to fix. (We are older, and the apartment was up 4 flights of stairs.) Five days later it was fixed, after Prague Days contacted the elevator emergency service, but it broke down again for several days before we left. (We were there a month.) Four days before we left, we lost hot water and heat. Prague Days provided heaters, but we were unable to take a shower for the last 4 days.