The room is fine and even pretty clean - few things have to be fixed however (i.e. several lightbulbs).
Do not expect however to have a cozy living space next to this cozy room: the latter is just a bunch of boxes laying randomly around.
The host answers quickly, but won't go further than the strict minimum in accommodating you.
The best part of this apartment is the location - 100 m away from Charles Bridge, 10-15 min tops by foot to most of the city historical attractions/museums!