I am writing this e-mail to request you please provide accommodation for a week,as I am new to the place and Also please provide me the phone numbers to who I should contact.
I think it's grammatical, marginally. I'd recommend rephrasing it, 'cause as it is, it's rather like commands. I'm quite busy at the moment so this is all I can help now.
I am writing this e-mail to request you please provide accommodation for a week, as I am new to the place and Also please provide me the phone numbers to whom I should contact when I reach Chennai.
> I'm writing this email to humbly request an accommodation for a week, as I'm new to the place. Also, it would be very kind of you if you provided me with the phone numbers of whom I should contact when I reach Chennai.