We loved our stay at U Pava. It was a 5 min walk to the Charles Bridge, and faced a quieter courtyard. The hotel was lovely and clean. Our room was large enough for a couple. The bathroom was in good shape, with just minor repair needed on the door to the bathroom. It dared from 1600's, and was well kept for such an age. Breakfast was outstanding, with eggs, fruit meats, cheeses and small pastries.
The only thing i would mention is that you must be able to manage narrow stairs with your luggage. We were on the 3rd floor.
We used the airport transfer arranged by the hotel, and were very glad we did.