We had a nice stay at Janina and Cesar's place, very friendly and respectful couple.
The room is tiny but the bed is big and comfortable. The apartment is 2 minutes walking from the train station, we slept with the window open so we heard the train but l took my ear plug and slept well.
To summarize: great value for money! (80€/night all included).
And thanks again Janina and Cesar!