It's really essential that you pick up a pocket wifi at the airport. It's very easy to get lost. I had an uber drop me off at ana intercontinental, pocket wifi, AND a stranger try and help me find the place but it still took us a long time...
Once you find it, though, it's very easy to locate since it's so close to tameike-sanno station. That station has to be one minute away and it is extremely convenient and it's the ginza and shibuya line.
As for the apartment itself, I was happy because there was an elevator that will take you to the fourth floor. The apartment itself is split into four sections. The first section, the entrance, also has your bathroom. The bathroom is equipped with a small tub and also a standing shower. I never quite figured out how to make the water hot. It also has body wash, shampoo, and conditioner. Refills can be found under the sink. The bathroom / entrance is separated from the rest of the apartment by a door. There is a hanging cabinet at the entrance that has a yoga mat and umbrella, which was extremely useful.
The next section is the kitchen. It has a stovetop (maybe an oven), microwave, and automatic kettle. This section also has your washer dryer, trash bags, laundry detergent, and the hanging piece for when you need to dry your clothes.
Moving past the kitchen is the living area. It was bigger than I expected, and simple, and clean. Definitely enough space to stretch out and do yoga. The pictures here accurately reflect what the living area contains.
The bedroom is separated from the living area with a clear wall of glass, no curtain. The bed is an air mattress, but it's also the nicest air mattress I've ever seen, and it's easy to refill with a switch on the back. I found that this did not disturb the quality of my sleep, but it may be uncomfortable if you have two bigger people using it. The closet has hangers, which I appreciate. There is also a small balcony, which I used to dry my clothes, and to let in light, but it does not offer much of a view.
Overall, the apartment is bigger than I expected, and extremely quiet and peaceful. I never heard my neighbors. The only time I would be disturbed is when there were drunk people walking underneath.
I would recommend it for its convenience and peacefulness. It also feels very spacious if you're just one person.