My questions are
1. What are my chances of contracting any STDs? Mostly, i am concerned about syphilis/herpes/pubic lice and other bacterial STD diseases, which i heard could be transmitted not only in sexual direct way?
MAYBE pubic lice from the towels or sheets if they weren't laundered or changed between clients, but those aren't actually all that common anymore. The rest you have no chance of as those need direct, unclothed skin to skin contact, like genital to genital or mouth to genital contact.
Hands do not transmit STDs, nor do breasts. (Breast milk can to newborns, but you're an adult, and that doesn't apply here.)
2. Can i contract any sexual disease, if the bedsheet and towels were not clean enough from previous clients?
See above. Very unlikely, but theoretical for pubic lice. It's uncommon enough that I wouldn't spend any time worrying about it.
It sounds like the woman was taking care to not get anything from you - remember that her livelihood depends on this - and that you don't have anything to worry about.