Dear Dhruv,
Please find the response below:
1. Yes, you can claim HRA and home loan principal and interest
2. In my opinion, this is a justifiable reason.
3. You will get standard deduction of 30% from your rental income. Apart form it you will get the dedcution of municipal taxes actually paid. you cant claim the maintenance separately, its subsumed in 30% standard deduction.
Please feel free to call/revert in case of any doubts
Thanks and Regards
Abhishek Dugar
CA CS B.Com