We loved Martin's place! It is just outside the main attractions of the city, but easily accessible by metro and only took about 10 minutes to get into the heart of the city and about 15 minutes to the summer palace! He gave great directions that made it easy to get to the apartment on our own, everything was sparkling clean, and the place was stocked with everything we might need during our stay. There is a grocery store just downstairs and some great restaurants in the neighborhood. I would recommend this place to anyone going to Vienna!