Lena seems like a very nice person and is very quick to respond to messages. However the common areas of the building need attention. They are dirty and dark which may be out of her control. The apartment itself is cosy and warm. However there are no curtains in the bedroom which is directly across from a building a few meters away so not ideal for getting dressed. Also with no curtains you are woken very early. The duvet on the bed is also smaller than the bed, fine for one person but in winter if two people are in the apartment, one person is going to get cold.
The bin was also not emptied before we arrived which resulted in a smelly apartment by the end of our stay (5days).
Location is convenient, close to the centre, train station for train to the airport and the Austria Centre.