@Mame,
Like green witch I've been involved with design of peoples' homes and gardens, not usually in my case as a means of sale, but general improvement while dealing with clients' needs.
I'm pretty biased re detrimental "improvements", and usually come down on attention to the nature of the house itself and the nature around it. If the house has no inherent 'nature' - and it usually does, then I can see neutral style. And at least clean.
On the other hand, I spent a lot of years hating a certain white paint, navaho white. Anything but navaho white... anything.