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 , ...
RÃ©union de dames, Abraham Bosse, 17th century. A salon is a gathering of people under the roof of an inspiring host, held partly to amuse one another and partly to refine the taste and increase the knowledge of the participants through conversation. These gatherings often consciously followed Horace's definition of the aims of poetry, either to please or to educate. Salons, commonly associated with French literary and philosophical movements of the 17th and 18th centuries, were carried on until as recently as the 1940s in urban settings.