2 single beds 90cms width, shower room with toilet, separate from the bedroom
This room is rather an "alcove," because you have to cross to get to the other parts of the basement. However, it has two beds, which are not auxiliary beds, comfortable and practical. It also has a shower suite (with toilet) which allows the room to be consider as a bedroom.
It will be perfect for young children to be close to their parents' room for example.