It is big enough even for 5 person. It is clean, tidy and well furnishing with sofa, table, air-con (for cold & warm), refrigerator, cooking stuff. The bed is comfortable (not to soft) and the environment is very quite for a good sleep. It take around 12-15 mins walk from Ueno station. There is car rental nearby (15 mins walk).
The only things not good enough is on 2nd floor without lift, no WiFi, no TV and no heating system in the bathroom. But it is still worth to stay with this price. We have a nice stay in this apartment.