We stayed at Karin's place for 12 nights and had a great time.
The apartment is very clean and has all required amenities for a long stay, plus Karin provided us her travel cot for our baby.
The location is awesome:
•	~10 minutes walk to Wien Traisengasse Bahnhof train station (which has S7 S-Bahn train to the airport).
•	~10 minutes walk to Tram No 2 stop
•	~15 minutes walk to U6 (underground metro station)
The check-in was very easy as well.