Hero Massage does not seem to have a website.
From the utopia-asia site:
65 Sukhumvit Soi 11, 02-251-1033, 02-651-2358. Enter Soi 11 from Sukhumvit, make a left at the end of the Soi and follow the road until it hits the canal (Hero is on the left). Well-run facility with restaurant is one of Bangkok's best. Massage areas are clean and private. VIP rooms available. Very popular for its privacy and good service.
You can take a taxi there, though I think you'll more likely than not find the taxi-driver completely clueless too, and he'll be asking you for directions.
Or you can take the Skytrain to Nana station and almost at the foot of the station stairs, you'll find the entrance to Sukhumvit soi 11. However, it's a 1 km walk in, almost until the road ends at the edge of the canal.
For a satellite picture, go to
www.wikimapia.org, do a search for "Bangkok", then another search for "Kallista Mansion". Kallista is the condominium block more or less opposite Hero.
Hero is also next door to Liberty Park 2, another condominium block, but somehow a search on Wikimapia does not work for Liberty Park 2.