I’ve been residing with GetSetHome for the past two years in Bangalore and Now in Pune.
They’re fairly decent in terms of stay, cleanliness and no extra hidden costs. They’re transparent on what they’re charging and they are always on their toes to help you out. Danish was in particular very helpful for my shifting from Bangalore to Pune. I’m pretty sure they’re present in Mumbai too.
Just have a look at their website. They’re super tech-savy and you get all your answers online itself.
Also, you can try the broker route, but its going to be expensive paying the brokers plus their approach is not that great. Unprofessionalism in talking and fake attitude anyway adds to your already miserable pain.
You can try Facebook groups like Flat and Flatmates etc. You get a lot of help from there.
Good Luck! Happy hunting.