I was able to pick up the EY fair sale on Christmas Day. Now I am flying in to BOM and out of DEL. Just have a couple questions hope someone can answer.

I am getting in on saturday night, currently booked at the country in and suites in BOM for 2 nights. Then taking a night train to DEL on Monday night, staying two nights and flying out of DEL on Thursday night.

In BOM, is the country inn and suites in a good location(transit and visit)?
How is the night train between BOM and DEL.
DEL is a big town which area should I stay or which hotel (best use of points at a chain)

Thank you!