Our stay at Boris' apartment was comfortable and enjoyable. The location is great! Right next the main train station with a subway entrance even closer to the apartment. The building itself was easy to find and Boris' instructions for entering the apartment were simple and easy to follow. The apartment itself is small, but super clean and more than enough space for two people. Our favorite part about the place was the balcony, which was great for eating and sitting outside! I would definitely recommend the apartment to anyone visiting Vienna!