I don't like writing bad reviews because most of the time they are too personal.
But in this case I want to share my experience and hope that this will not happen again to anyone:
We arrived in the dark but within the regular check-in times. Everything was dark. We rang the bell at the gate for about 30 minutes and even tried to reach Albert House by phone. No reaction. We had already paid the price for the overnight stay + breakfast, so we waited.
However, as it got later we decided to look for an alternative to stay for the night and luckily found something where they were willing to open the door.
We found out later that there was a power blackout and assumed that neither doorbell nor telephone were working. But honestly, if I am awaiting guests, I have to make sure they can reach me somehow - put a note on the gate or anything.
And to make it even worse, I wrote two e-mails (one on the same evening and one just after we came back to Germany) - NO REACTION AT ALL, no apologies or anything. This is really diappointing.