http://sathornsaintview.com/
The Sathon Saint View serviced apartments just off Sathon Soi 11 in Bangkok (very close to where I used to live).
http://en.9apartment.com/
Good site for apartments in Bangkok, includes categories for places with high speed internet, wifi, or close to mrt/bts but doesn't appear to allow combining of searches. Some really cheap places, like 3k THB and upwards.