I would never say that a backpacker's hostel with shared bathroom and 2 x 3 meter rooms with concrete walls can be considered good but - what a surprise! Kangaroo is very well located in a calm Asakusa neighbourhood of Tokyo and has some advantages that shouldn't be ignored :)
There is so much to visit around (Sensoji Temple, Welcoming Cat temple, charming little streets). Also there is a supermarket (not 7/11 but a real supermarket) just few minutes walk from the hostel - in the evenings there always have discounts on the sushi plates, so you can have a really delicious dinner for so few yens! The most important for all those who have Japan Rail Pass - Kangaroo is just 10 min walk from a JR station. You may not think about it at first but when it comes to pay 2 EUR for a single metro ride in Tokyo, then you start to appreciate the fact that your hotel is not far from a JR line, which you can take for free with your pass.
About Kangaroo itself - the rooms are tiny but equiped with a fridge and a small table. There was never a queue to the bathroom, there were hear dryers available. There are computers in the lobby, wi-fi, comfy sofas... Really, this hostel is worth to be recommended.