Reiner is a kind and rekaxed host. He's happy to answer all kinds of questions. Also very easy to contact via whatsapp when he's not around. The appartment is situated at a great location, a major subway station and several bars/restaurants down the street (carfree, but because we were there in the middle of the summer, +35°C with the windows open it was sometimes noisy at closing time of the bars).
The kitchen/bathroom/toilets were not very clean (apparently the cleaning lady was on holidays for 2 weeks), therefor from my experience, I would recommend this appartment to students/backpackers/adventurous people.