Alzbeta apartment is wonderfull. Very luminous, warm, it has a very complete kitchen, a great collection of books and a radio where you can connect your phone.
It is well located, 7 min to the center by tram or 20 min walking (much better alternative because you walk next to the river, beautiful!)
The best part is Bet, very preocupied, nice and responsable. She gave us many recomendations that made our stay in Prague the best.
I totally recomend this place.