Paul's place is the perfect location for staying in Zurich. Easy walking distance to 2 major transport hubs (train and tram). But the city centre is also within walking distance if you're accustomed to walking around. I think you could easily stay here and never have to buy a ticket for the city transport!
Many supermarkets are within a few minutes walk. Cooking facilities are a little limited as there's just a hot plate and kettle. Only thing that would make the place more convenient is a microwave and a proper chopping knife.
Bed is a little on the small side for 2 people, but perfectly fine for a couple nights. Great table/desk set up for comfortable laptop use and really good wifi!