It's not the Taj, but it's spotless, comfortable, quiet (a blessing!) and very close to the airport. If you have an early morning flight, check in here the night before rather than drive to the airport for three hours on your last day. Good breakfast, too.
International Airport Approach Road, Marol, Andheri (E), Mumbai, 400 059
www.miragehotel.in
Google map: tinyurl.com/2vcduck