Alex is a very helpful host and provides many information, especially if it is Your first visit in Prague. The apartment was clean and in a good area with nice bars and cafes nearby.
The only unconvenient side effect is, that You first have to check-in at their rental agency office nearby central station, to get the keys for the apartment. This also makes it a little bit unflexible regarding check-in and check-out times, because the timescale is organized for all apartments together.