The Mühlbach Haus is a hotel, and not a B&B. As other reviewers mentioned the food is great ( both dinner and breakfast ). The owner is of Dutch origin, so next to German both English and Dutch are no problem. The rooms are rather small ( shower/toilet room of n°7 is miniscule ). The water reservoir in our room n°3 was leaking ( inside ), making a dripping noise throughout the night. We had also quite some noise from the restaurant area right below our room.
The village, Abenden is rather nice, with nice hiking possibilities. It is 51K from Aachen. So it is a nice place, but at 60€ per room per night, only average price/quality .
