Been here number of times. Best time to visit the church when it is not crowded. It is just so peaceful. You feel so meditative. I avoid going during the Bandra fair though, it is too crowded and messy. The architecture of the church is so beautiful that you wonder how it must have been built so many years back without the modern infrastructure.
On the opposite side, you climb up the stairs towards the grotto and you can just lean over and see the Arabian sea. The view is just so beautiful and calm. I love going to this church, feel it would grant you your every wish and if not the wish, you come back, feeling good and restful.