A nice place to have a rest, people-watching and if weather permits, enjoying some sun at the terrace. Great views and affordable prices in the basic (but tasty) meals in the street-level cafe (Design Museum Café, open daily 10AM-5:30PM).
(For a more upscale experience, you have the Blueprint Café on the first floor. It claims to be “the first restaurant in the Butlers Wharf Gastrodrome”. It has stunning views from the City of London along the Thames to Canary Wharf.... I did not tried this one, but looks great, maybe for a special occasion, next time! :-)