NB: The map marker at HappyCow is incorrect! Try googling the address in russian and you'll get the right place: Govinda, vegetarianskoye kafe, Фурье ул., 4, Иркутск.
Very cozy restaurant. The staff was very nice and friendly but didn't speak English, however we could just point at the food we wanted since it's all there at the counter and it's all vegetarian. We also had help from a friendly customer next to us in the line, so if you're vegan, maybe there's someone there to help you ask about ingredients. Since the restaurant is in the center and we lived pretty close, we even went back a couple of times during our stay in Irkutsk. The food was really good, I would definitely recommend this restaurant.
Updated from previous review on Monday October 13, 2014
Cons: No English