The house is perfect for 2 people travelling. There's a super mart nearby and a daiso one level up for convenience. Also a 7eleven and family mart. There's also an ATM right inside the train station. Tomoko is a great host as well, she is extremely friendly and helpful. She let us borrow a scale to weigh our luggage, which was very nice!
I'd say the marunouchi metro line is perfect for fast and convenient travelling. I'd definitely recommend to anyone that is staying in Tokyo to stay in a place near a train station with marunouchi line, as it connects to shinjuku, which connects to yamanote line. It also goes straight to Tokyo where you take the Narita express. It also connects to other lines that were convenient for us. I recommend Japan Travel app!