When I booked the hotel online, I was asked if I wanted a 2-persons bed or a twin room with 2 separate beds. Because I went to Zürich with a colleague, we didn't want to share a bed so we chose the 2nd option. When we checked in, they first said that the room would only be ready in an hour (if we wanted the separate beds). Then, when we entered the room, there was one 2-persons bed and a very narrow foldable bed (probably good for children but not for an adult to sleep in). This was very disappointing because clearly now one of us would sleep well and the other wouldn't. So I would recommend the hotel not to call this a twin room but instead a family room.
For the rest, the guesthouse was fine.