The place is situated in a quiet neighborhood. It's a bit outside of the city center but the metro station is about 10 minutes by foot (or 5 minutes by bus). At first I thought the distance might be an issue for me, but it wasn't really a big deal. I even walked to the station a few times instead of waiting for the bus even though it came by every 10 minutes or so.
Going to his place for the first time was really straightforward. He even included a guide with matching pictures and arrows, which I thought was awesome.
Mathias' place has pretty much everything you need. I was pleasantly surprised by the level of detail and care that he put into it: fresh sheets and towels, a nice comfy bed, a clean bedroom and bathroom that you wouldn't mind walking barefoot in. I've stayed in places where I'd count the days when I'll be checking out--but definitely not in this case.
Last but not the least, Mathias is an excellent host. He's very approachable and easy to talk to and gives his guests their own space but at the same time just a message away if you ever need anything. You can't really ask for a better host. Thanks again, Mathias! Til next time!