It will work, but it won't be comfortable and shorter people (especially kids) may have difficulty using it. The rim of most vessel sinks sits ~5-7" higher than the countertop. That's why you see vessel sinks with 30" tall vanities--so the final overall height is right about the same as an undermount sink in a comfort height (36" tall) vanity. Now, if you're looking at one of those really shallow contemporary/.art deco vessel sinks, that may be a different story.

Hope this helps!