There is no WI-FI in the apartment.
Welkeys promised to fix it ASAP, but on 3rd day, when I said I will cancel, they offered a compensation, which does not cover my costs, since I had to use internet in a roaming, and I have a lot of meetings. But, same as with missing WI-FI, they did not seem to care.
For the automated late check in, they also charge 22eur, not sure why.
It's strange, how bad managing company can ruin the impression of a nice apartment.