Our group of 16 (ranging in age from young adults to seniors) had a wonderful time in this unique house. The house was exactly as described, clean, with comfortable beds, and well equipped.
Lucca was a very helpful and responsive host, eager to ensure a pleasant stay. For example, when we mentioned a few items that we thought were missing (such as larger pots in the kitchen), he immediately went out and purchased them.
Even though the property is on a busy street, it feels secluded, hugged on one side by steep rocks. The center of Mödling with nice restaurants is only a 10 minute walk away, and the train station can be reached in 25 min. on foot. Trains to Vienna run frequently and take about 20 min. Every two hours, a bus (to the Mödling station) leaves directly from in front of the house, but we mostly walked.
A car is still useful, though, to see the surrounding country side, the Wienerwald, etc.
Some of us also took advantage of the hiking and rock climbing opportunities right in Mödling. We all enjoyed the wonderful "Heurigen" in the region, for example in neighboring Perchtoldsdorf. And "at home" we loved the pool, enjoyed playing frisbee on the lawn, barbecuing, or -- on a rainy day -- watching a movie on the big screen TV.
All in all, this is a great house for a large family or group in a good location to explore Vienna and environs.