Post in Chiang Rai, Chiang Rai, Thailand

Hi, I'm coming to Chiang Rai in a week or two (currently travelling in South Thailand). I plan to stay in Chiang Rai for a month or two (possibly even longer). I'm looking for cheap, basic accommodation for this period. The only requirement that I have is reasonably fast/reliable Internet connection as I will need it for work. Any pointers / tips would be more than welcome.