Alex and Kate were very helpful throughout our stay from check in to check out. They let us store our luggage before and after checkout, and their office is right next to the main station so you can easily take the bus to the airport. Upon check in, Alex provided us with a map they have made of Prague and gave us recommendations on where to eat and circled all the places we wanted to go.
The space was clean and a perfect layout for 2-4 people (we were 3). It was on a quiet street away from the noise but very walkable and easy to get to the main Prague sights. I would recommend Alex and Kate to anyone staying in Prague.