Peter and his wife were fabulous hosts and extremely warm and helpful in every way.
Their charming home is within 5-7 minutes walking distance from the newly-refurbished Oerlikon (Zurich) train station. Within the same area you'll find a Coop for grocery shopping, a few cafes and bars, and a fantastic sportswear store called BACHLI.
I near, and worked in, Oerlikon in 2010, and can confirm that it's become a well developed area with much to offer. Best of all it's only about a 5 minute train ride to the Zurich Airport, and a similar distance (in the opposite direction) to the Zurich HB (main station).
I would highly recommend that anyone visiting Zurich consider staying at Peter's home. the only thing to be aware of is that you'll have to ascend 2 fairly steep staircases to get to the top level; but that's not at all uncommon for apartments in Zurich.