"Accredited" interior design schools in Europe? 

1.  There has never been any such thing: contractors note that invariably, decorators are "gypsy businesses" and deal only in flattery, while ethical professionals steer clear of any such doubletalk. 

2.  Any American university has architectural engineering majors, and they include NONCREDIT units in interior design. 

You know your taste, decorators try to exploit your frailties, and the result always looks like a bordello.  That's because 95% of decorators got out of prostitution and retired to "interior decorating" when they lost their looks . . . but definitely not their attitude.

That is why contractors always set a second bid if there is a decorator involved: one to build the place properly, and the second to correct the disaster the decorator committed in violation of International Residential Code and International Commercial Code. 

If you want a livable interior design, talk only to a Registered Professional Architectural Engineer.

www.Olympiamasterbuilders.com