Our house (for the most part, a garden-variety rancher) was built in 1967. We have a modern dishwasher (2005 Bosch in black), refrigerator (2006 GE TurboCool side-by-side in stainless), and a vintage range (1959 Frigidaire Custom Imperial RCI-59 in Charcoal Grey). The amalgam of brands, vintages, and styles in the kitchen blends in perfectly, and nothing looks out-of-place.
While I have my vintage machines of varying vintages to play with in the washhouse, the daily driver W&D that get 14+ loads per week are modern (2003 Maytag Dependable Care washer, & 2002 Kenmore Elite dryer). All of the small appliances are vintage with the exception of a KitchenAid mixer and Farberware percolator I bought my mom for Christmas in 2005 and 2006, respectively.
The daily driver vacuums are a 90's Rainbow D4C and a new Sanyo Roto-Sweep stick vac. In my room I tend to alternate between vintage machines; currently I have my 1950's Hoover 62, 1985 Eureka 3319 canister, along with one modern machine--my new Dyson DC21.
Austin