I ate at Sahakari Bhandar almost every day during my stay in Mumbai. All dishes are vegetarian and the menu is impressive. Vegan dishes are not specifically marked but the professional staff is helpful and suggested a different delicious dish to me evey time.
Service is very fast and over lunch time many workers come here for a quick, cheap, filling and healthy lunch.
It's located right on the main tourist road in Colaba, opposite Regal cinema.