We visited haus Kolmfeld recently for a few peaceful days on the German country side. It is situated near a national park and cute villages. We had a nice walk in the village of Herrstein.
Haus Kolmfeld is a nice apartment with a kitchen, living room, bedroom, bathroom and a hallway. All are very well equipped and clean; including bedlinnen, towels, etc. A TV and DVD player are present, as well as some German boardgames.
The only criticism is that next time I would take my own pillow, as the ones present were a bit thin in my view.
All in all, higly recommended, especially because you pay less than €50 per night for the whole place!