If you stay here it's only going to be one reason really, the location.
The pros. The location is within a few minutes walk of two stations with great connections, and you're one stop off Shinjuku station which goes to just about anywhere you want. It also has about 200 restaurants within a five minute walk of the house.
As for the downsides,..The place is really small. I knew it was going to be small, but it was a bit of a struggle to even unpack my luggage. I definitely wouldn't want to cook anything in there, but again, so many (cheap) restaurants it wasn't an issue. There was no solid internet for my first two weeks there, only a pocket wifi with 3gb of data which was insufficient and took too long to replace. Lastly, the chair provided broke, and was replaced with a stool. Not ideal for any extended length of sitting. Lastly, the curtains were useless, at night I could probably read a book with the lights off.
Overall, it's a good place if you're not spending much time inside.