... but it comes with Swiss prices, and I don't think it has wifi.
Suggest you follow Castro's advice and separate the good coffee from good wifi.
Good luck!
My husband and I like Bovelli for coffee ( http://www.bovelli.ch/ )
Just to add to this thread-- worked at Plüsch the other day, near Goldbrunnenplatz.
https://en.yelp.ch/biz/pl%C3%BCsch-z%C3%BCrich
I liked it a lot. I don't know what it's like in the evening, but I was there from like 1p-3p and it was very chill, not busy, super friendly folks behind the counter. Good cappuccino, good quiche, free wifi, and I think some outlets around the store too if you need power. Not a bad place to get some work done for a couple hours. A bit of outdoor seating, too, if the weather's nice.
Head further down to the corner of Aemtlerstrasse and Gertrudstr. to Benzin & Koffein for superb coffee, bagels, wifi and service. It's always buzzing with English speaking 'home workers'. Best beans in town IMO.