A pretty standard good quality mid-range hotel. A bit of a hike to Ikebukuro Station, but tons of options for food, combinis, shopping, and entertainment in between.
Bed was very, very firm, as tends to be the norm, and the pillows were somewhat lacking (though there is a Nitori home goods store just a few blocks away that sells pads and pillows if you need them).
Some things were a bit weird: Putting used towels in a little bag outside the room; having most of the standard amenities in the lobby by the front desks; each room having its own individual WiFi point to connect to. Neither good nor bad, just weird.
There are 3 washers and dryers on the ground floor, but keep in mind they are designed for very VERY small loads; try to do too much at once and you'll end up having to hang things to finish drying in your room. There's a coin laundry a few blocks away that might be a better option.
The absolute best part of the room was having a full-sized wall-mounted heat pump unit; setting it to 20c got the room downright chilly.
The biggest downside really is location; Ikebukuro is a cool area, and if you plan on staying on the west side of Tokyo (Shinjuku, Shibuya, Nakano, etc) it's a good spot for a 'home base'. But getting to Akiba, the Skytree, or anything to the east and south (Yokohama, etc) can be more difficult than anticipated.