Thor's place is lovely and comfortable, and a very short walk from a number of excellent cafés and restaurants (that he will be happy to recommend to you). Also a very short walk to Gneisenaustrasse U-Bahn station, and thus all of Berlin's exceptional public transit.
Your host is super-friendly, full of info and tips, unobtrusive, and a really good cook. If you don't mind sharing space with someone (and two friendly cats) it's 100% recommended.