We were in Monika's place for 4 nights. In that time we had some little problems, the pool wasn't habilitated and one day we can park ourcar because another car was in our place.
But, in general we had a great experience. The cottage is really comfortable, fully equiped and all is clean. Monika and her husband are an incredible and lovely hosts.
One evening we share some beers with them in the garden and talk about our respectives experiences in Argentina and Germany.
I recommed Monika's house if you are visiting Berlin.