New, clean, modern apartment in a good location. I stayed for two weeks and would have happily stayed longer.
The bed is large and fairly comfortable (a bit on the firm side), the air conditioning is quiet, the bathroom is modern and spotless, and the kitchen though a bit small is fine for simple cooking. A large closet, dimmable lights, and places to hang clothes to dry inside are nice bonuses.
The furniture and layout are slightly different from the photos - there's no stand for the TV (it just sits on the floor) and there's a mini sofa instead.
The area around the apartment is quiet (they were doing construction next door but I didn't notice it much). Train and subway stations and lots of local restaurants are within a 5-10 minute walk, and you can find even more to do in Ikebukuro a longer walk or just one train stop away.
Tall people: I'm 189cm and the bed had room to spare. Any taller and you'll have stoop to enter the shower unit though.
Remote workers: The desk is just a little wobbly and a bit shallow but I had enough room to put my laptop stand and keyboard. The hard-back chair isn't great but isn't terrible either. There are a couple nice cafes for working from nearby around Otsuka Station.
As long as you aren't planning to do long bouts of remote work from the apartment I totally recommend it.