Hi Smitty
Bangkok I`ve no idea sorry but in Pattaya, if your first visit and only for a few days, choose a convenient location.
Anywhere between soi 1 and soi 13, running from Beach Road to 2nd Road will be OK to get about from.
soi 13 has a fair few hotels to choose from, great location.
soi bukhao also OK, can get about from there easily.
Most, 90% + hotels will have no problem with you bringing a guest back, a very few higher end ones may try to charge.
Before you book, ask on here, someone on here will likely know.