Obana is located on the eastern side of Tokyo, at about a 2 km distance from the Ueno Station. The nearest station is called Minami Senju. It is in a "shitamachi" (old Tokyo area) neighbourhood in a quaint building with the architecture of a traditional house.
The interior is just as charming. The wide dining space has tatami flooring and patrons dine at traditional low tables with cushions for seating.
The unaju is a grilled eel with tare sauce on a bed of rice. It is the signature dish of the restaurant so you should probably try this one if it's your first visit. You have a choice of two sizes which are ¥4,300 and ¥5,300.
For ¥4,300 you can have what is called shiroyaki style unagi. This is a variation of the dish with very basic seasoning which comes with some wasabi. You can experience the pure taste of the unagi grilled to perfection.
Umaki is a yakitamago (grilled omelette) wrapped around unagi filling. It is extremely popular at this restaurant. Some say it is the best yakitamago in Tokyo. A good idea is to have it as a side dish and share it. Umaki is ¥2,500.
The grilling expertize also works wonderfully for chicken on skewers (yakitori). This is also a popular side dish that is relatively more affordable at ¥1,200.
Your main order will come with some pickles, a soup with eel liver and some green tea. It might be a good idea to enjoy your meal with some sake! The restaurant is known for serving some excellent quality ones. Expect to pay around ¥6,000 for an unforgettable meal.