there is a handful of cheap short time hotels down a side soi off soi 4 on the left as you are heading towards soi 6 from nana plaza ,,the entrance to the side soi is across from hilarys,..ive stayed in these places before, not as a short time but for one or two nights to be in the sin triangle of cib why not and cindys..normally around 800 baht a night,, they are basic and clean but not somewhere u would take a girl if u trying to impress her,