This is a cozy, wonderful apartment for solo travelers or a couple of friends. It's a 7-minute walk from Otsuka train station (JR East Yamanote line). There are also great places to dine in, including a Michelin-star small counter ramen restaurant. The apartment is in a quiet neighborhood that's safe to walk around at night.
Andrea is a responsive host and easy to communicate with. Make sure to check her photo guide on getting to the apartment as G maps provides directions to a different house.