Matthias it is a friendly host, he will help you with whatever you need and also give you some city tips. The apartment it is really nice, modern, clean and quiet. The room it is ok, bed really comfortable. The only issue it is the internet connection, wifi hangs many times, i tried resetting the router as Matthias suggested but time to time it hung again.
The location it is good, 10 mins walk from the train station and 15/20 from the city centre. After all i recommend staying here.