We had a good time in Prague in Ullvi's apartament, even though we didn't like a few things. The apartament was on the third floor of a bilding placed on a steep climb, but of course this isn't the host's fault. Keep in mind that after this you also have to climb giant stairs to get to the bed, because it is on a mezzanine, which is a bit uncomfortable.
Overall the apartament was fine, even though we found the WC a bit dirt and the towels we were given were stained. By the way, I'm quite sure these were just oversights.
The location is good, since it's near a supermarket and a tram station that takes you right to the city centre.
I would recommend this apartament, just make sure you don't have heavy lugagge or you'll get really tired!