I was there in 2012 from January till March. Found the guesthouse through WOOFING and contact the owner to volunteer there.
Guesthouse is located in the idyllic Üetliberg and is very good accessible by public transport. Train is coming to a station that is on 20 m from the guesthouse. Because the rule of protected area, cars are only allowed to drive to Top Of Zurich if they have permit. So many people decide to come with the train. There is direct train from the Airport to Uetilberg. I took that train and after not much travel i arrive on the station.
From the station through the forest road will take you to the guesthouse. Owner of the house Jacqueline is always there, she live there with her two kids.
After receiving you with such a warm welcome she will show you the room and explain you everything. In the yard there is a pool too. For the summer can be perfect cause offer refreshment and breathtaking view on the city of Zürich. Guesthouse offers a living room equipped with a clay stove that inspires this cosy room. An open kitchen connects to the living room. The upper floor is a spacious bedroom perfect for relaxing nights with the highest level of comfort.
Wireless Internet is available in all rooms. A large garden with a pool is also available (B&B certified with 4 stars).
The apartment have shared living room , 2 rooms with king size beds and downstairs separate small apartment with bathroom , entrance and kingsize bed plus sofa. This apartment is also equip with fireplace.
The both guesthouse have central hitting so is warm during the winter. They also have washing machines and yard.
Owner is fantastic communicative women that is willing to help you with whatever you need. She speak several languages so you on your native languages.
Guesthouse is surrounded with really nice nature.Forest is amazing and you have really good hiking trails around the place.
Prices are 230CHF in high season and 190 CHF off season . High season is from March to October , low season is from November to February.
I would highly recommend this place. Nature, atmosphere are worth to pay for .