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.

Kangaroo hotel was my last resort as I was looking for a hotel with an en suite toilet. Stayed in the 4 bedded room for the first night before shooting off to Osaka the next day. The room would be suitable if you were staying with kids and have only 1 big luggage. We had 4, and that meant that one of us had to keep our luggage outside while we were trying to unpack since there was no space at all. We literally had to climb over our luggage and crawl on beds. Despite the size, and hard concrete walls, the bed was surprisingly warm. We slept straight through without waking up. The toilets had heaters with a strong pressure. We stayed in the 2 bedded tatami room for the remaining 7 nights. Just enough for 2, although whenever we had to open our luggage, we would fold the bedding up so we had more space. It's 15 minutes away from the minamisenju station. With a 7-11 and Shimagaya nearby, and Santoyu just outside minamisenju JR station. There's a McDonalds there that is open 24 hours. Shimagaya has really good bento sets that can be brought back to the hotel and heated up with the mcicrowave :) Oh, the toilets has no bidet, and there is no hose, so it was an inconvenience for some. But never the less, the friendly staff and comfy bed made up for everything else.