Unique with the meaning `being the only one' or `having no equal' describes an absolute state: a case unique in British law. In this use it cannot therefore be qualified; something is either unique or not unique. However, unique is also very commonly used in the sense of `remarkable' or `exceptional', particularly in the language of advertising, and in this meaning it can be used with qualifying words such as rather, quite, etc.
The totally unique approach of Sola Salon Studios is that we provide high impact , modern , and upscale rental space in a  salon mall  concept that allows salon professionals the opportunity to have their own business and make more money without the risks and challenges of owning a conventional salon... .all for the same rate as a chair rental , ...
A salon is a place where people have their hair cut or coloured, or have beauty treatments. ...a new hair salon. ...a beauty salon. A salon is a shop where smart, expensive clothes are sold. A salon is an informal meeting of fashionable writers or artists, which is held at the house of someone who is well-known. Salons were more common in former times. His apartment was the most famous literary salon in Russia.