If you're looking for a quiet coffee-break spot after an afternoon of museum-going, Le Landaulet is worth checking out. It has a relaxed atmosphere and a good view looking out over Ueno Park's famous lotus pond. The big dining room affects a 1970's Showa-era Japanese aesthetic, complementing the menu offerings of classic yoshoku fare like Hayashi Rice and beef stew.
Desserts like kakigori shaved ice and Coffee Jelly with Blanc Mange are more elaborate than expected, and quite tasty. The cafe is attached to the historic Ueno Seiyoken, which was founded in 1872 as one of Tokyo's first French restaurants.
This book will introduce you to more than twenty of Japan's favorite specialty foods that are less well known abroad, along with a guide to the best places in Tokyo to try them and expert tips on what to order. From Bento.com.