The Ivy Guesthouse is next to the central market and has an excellent restaurant (try the stilton burger) and bar with Angkor beer on tap. The rooms have modern air-conditioning and the ones at the front have a balcony to watch the bustling marketplace in action. Rooms have hot showers ensuite. The best place I have stayed in south-east Asia.
On the south-west corner of the central market place.
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Great food, extremely helpful staff, clean and comfortable rooms with fans and ensuite toilets & (customary cold) showers. There's also a pool table and a fab roof terrace with sofas and hammocks, perfect for enjoying cold beers and exchanging tales with fellow travellers.
If I remember correctly, price for twin ensuite room just for myself was $5 per night.