As a residential architect who also does interiors, I feel the architecture must be right before the interiors can be successful.
The client's budget, needs, and lifestyle, as well the neighborhood and site itself direct the design. Correct scale inside and out is most important. There must be a strong point-of-view. There should be drama and romance but never ostentation.
I strive for simplicity, quality, beautiful detailing, and perfect proportions. A good design should not be trendy or dated, but timeless.