The location is only a few minutes down the street as soon as you exit the station. Makes it very convenient to get around especially if you like Ikebukuro. There is a Lawson on the way so you can grab snacks and drinks when you come back.
There is heating as you need to use the AC unit and you might have to give it a few moments to warm up and turn on as most units when heating are not instantaneous. I recommend that you download Google Translate to use with the camera function to help you use the remote. Or message the host for instructions if you still can't seem to figure it out.
As a larger sized American sitting between 5'10 and 5'11, the bathroom and toilet were a bit on the small side but it was manageable I guess. There is no separate room to change clothes after you shower however as the shower room is directly connected to the kitchen area and the entrance. The toilet is directly to the right of the entrance way once you come in.
The heating is mainly focused in the bedroom and can spread out to the next room over which is where the TV and couches are, but the kitchen and beyond will likely always stay cold (or hot if you come in the summer).
Don't expect anything extravagant but this place is a good choice for the price and convenience.