Great view from the living room/terrace, spacious kitchen with everything you might need for cooking, a comfy bed and a rather quiet neighbourhood at night (at least when I was there). The room itself doesn't have air-conditioning, but it's possible to use the one in the kitchen or even do cross ventilation in your room at night since it has a balcony door *and* a window. Prague had temperatures of over 30 degrees during my stay, and the room didn't feel hot at night.
Veronika is a very approachable host and interesting person :)
Just go for it, can't do much wrong here!