Will hotel room attendants be harassed by guests?

Generally speaking, no, even if some guests occasionally break the rules, you can use the hotel's formulaic service language to answer all his requests or questions, and he will lose interest and stop harassing you.

Room attendants in any star-rated hotel will never provide services outside of work, such as (massage, massage, …). Those services will be provided by others who specialize in (massage, massage, …).