Last trip I stay at the Ivory Suvarnabhumi.
http://www.theivorybangkok.com/
Not fancy, but great value for money. I paid 1,000B and it´s just 10 min from the airport.I use it for short time room just before my flight, but have no problem to stay there all night next trip.
Some cheap resturangs in the area and a massage place on the same street. Neg is no swimmingpool.