We stayed for three days and two nights at Jet's and Frank's house. They were very welcoming and had a city-map for us when we arrived. The room was very comfortable (especially the bed) and clean. Furthermore, the house is very well located (10 minutes on foot from the station and 2 minutes to public transport, which are very well organised and let you get around town very easily).
I can totally recommend your stay there, we had a lovely weekend!