You don't want to stay to upscale with the accomodation they usually frown on overnight guests Holiday Inn has a definate no guest policy.
Look at the mid to low range places if you want guest friendly there is a list in this section.
Longtime refers to allnight and shortime refers to about 2-3 hrs rates vary depending on girls.
If you are worried about security you should always keep your passport and money etc in a safety deposit box or in room safe.
If you take a girl from a bar or gogo remember which bar it was then if anything happens ( hardly ever does in this situation) go see the bar manager/owner and tell him your problem.
This hotel is a little bit more upmarket and guestfriendly overlooking Patong from the hill you will need a motorbike to get around or taxi.
http://www.hilltophotel.com/
I also recommend this place get a deluxe room pool side great restaurant as well not far from the action.
http://r24.org/phuket-info.com/phuket/salathai/