I usually use this hotel when I go on business trip to Bangkok. The hotel is located 30 mins away from the air port by a taxi. It is bit far from the central area of Bangkok, but I enjoy local shopping center like "Mega Bangna" etc.
We stayed this hotel for a night as our flight schedule was ETD at 2:00 am.
It takes about 30 min. and 200 THB from hotel to airport.
Or you can take a taxi to Hum Mak station and get on airport link train to the airport.
The hotel is clean and made us relax.