I stayed in the apartment for 3 weeks and felt very comfortable there.
I haven't met Boris in person, but he always quickly responded to my messages and queries, and even left a welcome gift for me.
The apartment is exactly like it loodks in the photos, freshly renovated and light, pretty quiet thanks to new windows. All the appliances work well, as well as heating. There were also some cleaning products and cooking spices, which made it more habitable from the start.
The location is good in terms of transport. 3 minutes to Westbahnhof train station with two metro lines, trains and airport bus. Many trams around, one going directly to the city center. Supermarkets and stores at Westbahnhof and around. Just one comment, I wouldn't hang around the train station at night.
All in all, good experience, would stay there again.