Dream Guesthouse
Located on a small road left off sukhumvit thana choeren, just south of the market, offers simple, clean rooms at fabulous rates ~100 baht for twin room with fan. dec 2011: 150/450 baht for fan-shared-bath/aircon-private-bath friendly advice is available in english from the resident owner.
Guy Guesthouse
Located in the guesthouse area left off sukhumvit, has simple but somewhat dirty rooms starting from 100 baht, including free high-speed >3mbps wireless internet. offers travel services including tickets for boats to nearby island.
Orchid Guesthouse
Located on a side street south of the market area, the front operates as a restaurant serving thai/western fare. room rates 130+ baht for fan rooms. has air-con rooms, and also free wifi for guests. friendly advice is available in english from the resident owner.
Trat offers some of the best value hotels and guesthouses in Thailand.
Sawasdee Guesthouse
Next to orchid. the front of this guesthouse is run as an internet cafe. very basic but nice rooms with cozy singles for 100 baht with fan. doubles and triple also available.
Travel a bit further down the side streets south of the market off the main road Sukhumvit to find the guesthouse area with more choices and a bit more character.