Perfect location right on the old town square! Easy walking distance to the Charles bridge and most major tourism sites. Tons of food and drink nearby (check out Lokal! I am in love with their puréed potatoes) and if you're a celebratory type you can experience all the late night festivities. It is pretty loud in the square until all hours, but that lent charm to the experience, as it reminds you of the wonder and excitement at your doorstep.
The actual apartment is clean and beautiful, with big double windows opening out onto the square. I cannot stress how lovely it is, with a nice big kitchen and a cool window that looks out onto the main room.
Thomas is a fantastic host and while we didn't use them, he provided a cell phone, a hard drive with movies in English, and also stocked the fridge with breakfast supplies. It was a wonderful attention to detail and so considerate if him.
I can only hope that we could rent Thomas's flat the next time we visit Prague.