Time Out says
The magnificent Hotel Chinzanso in Bunkyo is one of the top hidden cherry blossom-viewing spots in Tokyo. Boasting around 20 kinds and a total of 120 cherry trees, the Japanese garden here is usually bursting with colours from the end of February to the middle of April, and is best experienced with a hot drink in hand. Free to enter for all hotel guests and restaurant customers, the garden's sakura trees are lit up rather spectacularly from sunset to around 11pm daily. The hotel also offers special room deals, buffet menus and sakura sweets during this period, so look no further if you want to get away from the rowdy hanami parties going on all over the city in spring.