Dear Sir/Madam:
Ram Ram
I live in Mumbai city & am just a devotee like you. I don't have any connection with Kainchi Trustees. I suggest you write them a letter and post it. They will reply to you.
If Baba ji wishes you will get a stay at the Ashram itself. Otherwise there are may hotels and other accommodations near the Ashram. You can book them online too.
Feel free to write to me if you need any assistance.
Regards,
Jitendra. Thacker.