Alex' apartment was good. Its biggest advantage is its location in the middle of Prag. You can reach everything by foot and still the flat is rather calm (you cannot avoid a little noise in the night while being in the center of a capital :-) ). Alex was always helpful and provided proactive hints and tricks.
The flat was clean. Only the bathroom could be a bit cleaner. But I guess this is rather a construction issue - there is no fan and no window in the bathroom. Therefore a few flecks on the ceiling cannot be avoided.
Overall we felt really welcome and recommend this flat and this host.