This is not a traditional restaurant in the sense that it's not advertised at all from the outside. You need to buzz the lowest button on the door to get in. The location is near the opposite side of the street to the James Joyce pub, so if you can see that, you're close.
The place itself is up a short flight of stairs, and into another door where there are some meeting rooms presumably for environmental groups, and a kitchen. The great thing here is the small outside terrace. It's not exactly a rooftop view of the Bosphorous but they have created quite a pleasant atmosphere here.
Meal options seemed to consist of 5 or 6 different mezze style dishes, all were vegetarian but they mostly all seemed vegan too. I just asked for a mixed plate - it was typical Turkish food but nicely done, including rice, beans in sauce, aubergine and some other mixed veg.
The total for the mixed plate, a beer and a tea was just 15TL which was very good considering that beer is typically 8TL in most places. For Istanbul, it's quite a unique combination to have alcohol + veg. food + low prices.
The dual community group/food & drink serving nature of the place is slightly confusing at first, since they don't seem to advertise it at all, but the woman serving us was very friendly and the whole place seems pretty chilled out.Pros: Central location, Good value, Nice atmosphere
Cons: Not primarily a restaurant