exact location of Sinu Hotel in Bangkok?

near Bangkok International airport

You sure you got the right name of the hotel. Never heard of it.

Check the name, location, and booking here .. http://www.silomstreet.com/hotels/bangkok

That hotel name is unknown. The closest things may be:
- Sena Place Hotel (17 Phaholyothin Road, Soi 11 Phayathai, Bangkok, 10400)
- Swan Hotel (31 soi Charoenkrung 36 Bangrak Bangkok)
- Sun Pavilion Hotel (55 Pattanakarn 65, Praveth, Bangkok 10250 )

You should find place in Thailand,is best at http://ruammirt.blogspot.com