Any hotel along the Skytrain line is fine.
However, traffic is going to be a problem and skytrain is going to
be your best friend to move around.
If you are looking for budget hotel or motel, you can try the Thai
House Inn, located along one of the skytrain stations.
My preference is to live outside the central BKK, Ladprao area,
which is nearer to the airport and Chatuchak market.