I attended Zoni for 4 months starting in June and had an incredible experience. The class sizes were small and the teachers were genuinely interested in each students experience at the school and in the city.
New York is a great city there is something for everyone, a great nightlife, lots of museums and fabulous food!
Regarding the language I was able to advance very quickly, having started as a complete beginner...I think the fact that the teachers were also very good at assessing and handling students individual learning speeds and language levels.
Overall just a fantastic experience and I would suggest to anyone wanting to study English go to Zoni