Had a wonderful 8 nights at Gerhard & Nicole's place. It's a lovely, clean, and modern apartment in a nice area of the city. I was traveling to Vienna for a conference on the other side of town, but access to the venue was quick (30 min) and easy thanks to the wonderful public transportation in Vienna. We were happy to be staying in Neubau given its proximity to sights, transportation, and good food. The hosts offered helpful advice on getting to the apartment and stayed in touch to make sure our stay was pleasant. I would happily stay here again in the future. Just be careful if you are tall (>~180cm) as many of the ceilings are low and slanted (especially in the bedroom). :)