We were at Michael's place with 4 kids.
Pros:
-	Very good value for the price
-	Spacious, bigger than on the pictures
-	Flexible booking conditions, and it really worked
-	Good transportation (U-Bahn, Tram, Car)
-	Friendly host (welcome package, check-in)
Cons:
-	Noisy street in the morning hours (2 of the 3 rooms are with street view)
-	No air conditioning (but a fan is available in all room)
-	Bathroom and toilet are a bit to small
Hint:
Travelling by car: take Spittalau P+R parking. Very comfortable solution.