This study was written at the Institute of Structural Engineering (IKI) at the University of Natural Resources and Applied Life Sciences in Vienna, Austria. The objective of this master thesis is the analysis of the ventilation system and of the satisfaction of the inhabitants with the passive house Molkereistraße (a student residence in Vienna). The following values were measured in order to analyse the ventilation system: power consumption of decentralised and centralised ventilation appliances, quantity and temperature of supply air and exhaust air of the decentralised ventilation appliances, also room temperature and relative humidity. The satisfaction of the inhabitants was investigated with the help of questionnaires and face-to-face interviews. This study produced five main findings: (1) the passive house Molkereistraße was judged by the inhabitants in a very positive way (e.g. 85 % of the students feel comfortable in the passive house), although (2) the room temperatures and the supply air temperatures are too high in summer and (3) the relative indoor humidity is too low in the heating period. (4) The power consumption of the decentralised ventilation appliances is higher than expected. (5) The measured quantity of supply air of the decentralised ventilation appliances is according to plan, the quantity of exhaust air is too high. From the technical point of view, some improvements concerning living comfort and energy efficiency can be obtained with little effort (e.g. reduction of power consumption of decentralised ventilation appliances by general maintenance work at regular intervals). The active assistance of the students is indispensable. A professional training of the students has two key benefits: a very energy efficient use of the passive house combined with the effect, that the students inform their relatives and friends about their experiences in the passive house and thereby disseminate the passive house idea all over the world.