We visited their place over the weekend. We came by car and they provided excellent advise where to park and where flexible regarding our arrival time.
The Appartement is in the 3rd floor, very clean and bigger as it seems on the pictures. The interior is modern but has a nice charming touch with the dark wood beams.
The highlight is the location, which is directly below the palace-hill. In 10mins you're either at the palace or the Charles-Bridge.
The kitchen had everything we wanted. A dish washer, coffee machine, big fridge, modern stove etc...
The bathroom is spaceous but the ceiling is very low because of the roof... So be careful if you're tall. The shower is a bathtub, not perfect but it works. And note there is an additional toilet with a washing machine.
The Bedroom ist large as well, with a very comfortable double bed.
If I visit Prague again, I'll definitely try to get this Appartement again!