Golden Horse

I would receommend hotels like Holiday Inn Pleonchit or Arnoma (cheaper). Both are located near BTS Chit Lom station.
Chit Lom = Central Mall / Zens / Gaysorn / Platinum Fashion Mall etc
National Stadium = MBK / Tokyo / Siam Paragon etc
Mo Chit = Chatuchak

If u interested in sightseeing, try taking the BTS Chit Lom to BTS Saphan Taksin.
From there, buy an 1-day river pass (Chao Phraya) & travel to piers "the chang" or "tha tien".
The Chang Pier = Grand Palace
Tha Tien = Wat Arun / Wat Pho

Hope it helps in your planning.