I agree that parlour (British spelling) has no negative connotations.
In the UK, 'salon' is more common than parlour when referring to places such as beauty salon/parlour, tanning salon/parlour.
A beauty salon/parlour will provide hairdressing, manicures, pedicures, hair removal, tanning etc. Yes, it is common and there are unisex salons/parlours, as well as salons/parlours specifically for males or females.
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