I'm not a Mexican food expert, but I went in this new place last night and I loved it. It's at Escherwyssplatz, in between the Kebab place and the Italian restaurant. It's owned by a young Mexican guy called Gerado and he has a couple of sweet young lasses helping him.
I'll be going in again soon with some Mexican friends and Mexican food snobs so will report back again about how good it really is. It only opened 2 weeks ago and I really hope they make it (it's on my route home!) Website
doesn't have much on it yet, but their FB page
has a bit more info. If you go let me know what you think!