Alex's apartment is located near the U and S bahnhof, so it's very convenient. And nearby there are two supermarkets, Lidl and HIT. But the apartment is at basement level, sometimes there is no phone network. On the 2nd morning we have no Wifi (connected but no internet). But we were out whole for tour so not much affected.
Alex is a nice host, he responded very promptly. We are happy of our stay.