Very, very pleased with Ai Quattro Angeli. Our split level studio had air conditioning in the lower level, but not in the upper level bedroom which as it is facing the windows can get hot but a fan was provided. The apartment was clean, the bathroom clean with a nice bathtub. It was accessible by lift although located between floors necessitating navigating a small flight of steps up and then down from the lift. Perhaps one could find a nicer place near Charles Bridge, however we found nothing to fault as it had everything we needed, was in an unmatched location within walking distance of museums, restaurants, cafes, historic sights, the Prague Central Train Station. We cannot praise it highly enough. Everything else will be a downer because of the convenience, location and utility of our studio apartment. The WiFi was quite fast as well, certainly faster that what we experienced in other countries. We would definitely stay again if it ever came to that. The office where one retrieves the keys and checks in is located just around the corner on Cerna. They do keep regular business hours so might be hard to contact for initial check-in if arriving late. However our check in representative was very clear about what was available, what was offered and the ins and outs of the check-in process and check out process. It was excellent value for money.