This advice is timely for getting to Westin Yokohama from HND, since it's both hotels are about the same distance from YCAT.

There's 3 of us (with wife and 11yo), arriving HND with only carry-ons, and planning to do the Keikyu Limousine Bus. However, we won't be able to make the last bus that stops at the Westin, so we'll just arrive instead at YCAT and taxi from there.