mumbai transfers

we're going to mumbai soon, spending a couple of days there, then heading to the hilton spa at shillim for total relaxation 
seems to be a 2-3 hour drive, can anyone recommend a reliable/safe/comfy company for the transfer? i've not been to india for several years now, but used to go often and have had some dodgy rides in the past

seems to be a 2-3 hour drive, can anyone recommend a reliable/safe/comfy company for the transfer? i've not been to india for several years now, but used to go often and have had some dodgy rides in the past