A nice, simple room with good access to the Toei Mita line, and Ikebukuro via the Tobu Tojo line. There's a convenience store right across the street, a grocery store two minutes down the street, and lots of good restaurants. The host responded very quickly and was very helpful when I had questions.
There's no way to cook, aside from a water boiler and a fridge, but I wasn't planning on cooking while I was staying in Tokyo for just a few nights anyway. A desk would be nice to have in the room. Instructions on how to use the water heater would also be useful for those of us who have mostly lived in countries where the water heater is automatic. The trick is that even when the water heater is turned on, it is only in standby mode when the water isn't running, so the water will be cold for a bit if you turn it off to put shampoo in your hair.