Peter and Engin are very polite and easy to reach, very quick to respond and they care about the comfort of their tenants. The house is near the Zurich Zoo, it has two supermarkets very close to it and a smaller mart that is open on Sundays about 10 minutes walk away. The house is quite big and old, but has several bathrooms and shower rooms, so availability was easy. They also offer a laundry service (at 20 CHF I think). I never used it, so I can't comment on that.
The first time I stayed at their place there was a miscommunication about the availability of the rooms which resulted in an outstanding refund and a bit of overreaction on my part. The hosts found a way to resolve the issue and gave me the refund, for which I am thankful.
Initially Room 6 had a strong smoke smell, which was due to previous occupant breaking the rules of the house. The hosts were helpful in trying to clean the smell and make my stay more comfortable. They also informed me that they are planning to renovate room 6 so I think this will not be a problem in the future. In fact, when my initial stay period expired, I did extend my stay in the same room for another week. Overall I recommend this place.