I contracted Viva from bangkokvisitors.com to do some product searches in Thailand for my company. I also contracted her to take me around to certain businesses and to also act as an interpreter while I was in Bangkok. She did a fabulous job with all tasks that were assigned to her, and has continued to go above and beyond to meet my needs. She always returns emails in a timely fashion and her English is very good.
Viva is very cost conscience and tries her best to save her clients money by suggesting more cost effective business practices, methods of travel, etc, to her clients.
I would highly recommend Viva for anyone considering a tour / business guide or interpreter. Her rates are very reasonable and she has a good educational background, and is knowledgeable in many areas of business, including importing and exporting.