Christian met us at the apartment quite late at night, but he was a great host and gave us a tour of the building. He'd even left us some cake and tea/coffee which was great after a long journey.
The apartment is on a very quiet street, you can walk in to the city centre quite easily, or just grab an uber if you're feeling lazy as it seems to be the cheapest way to get around.
The apartment itself is very big, but every room was well decorated, comfy, and very clean.
I would highly recommend staying with Christian, he was a great host.