We had a great stay in Prague! The rooms were clean and comfortable with very good beds and a nice bathroom. The metro is nearby and the street is quiet, the main road a bit further is very busy (but that's normal in a big city). It was easy to get in the city center.
The breakfast was good and the staff was very friendly and helpful.

A little advice:
The nearestby subwaystation (Pavlova) is very little and you can only buy tickets at a vending machine with Chech coins. At the crossroad is a bigger station (also Pavlova), where you can buy tickets at a counter.