A reliable mid-morning stop on Städtle for proper coffee, fresh pastries, and a generous slice of Vaduzer Torte (the local chocolate-and-nut cake). The interior is plainly modern; the terrace outside, with a view over the pedestrian street and the cathedral, is the better seat in good weather.
A useful base for an hour with a guidebook or a stamp catalogue between museums. The café also serves quiches, salads and tartines if you want a light lunch without committing to a full restaurant.