Naomasa-san was a fantastic host! Our flight landed later in the night, and it was a bit difficult to see the streets. BUT Naomasa-san had a video guide from the station to the apartment that saved our lives! He made it so easy to know what to do in terms of using the amenities, finding the place, local recommendations... He was also very responsive whenever we communicated with him! The place itself was fantastic - compact but had everything we needed! There were also instructions how to use the open air onsen, and it was a beautiful experience with a great view of the Tokyo Skytree :)
Overall, I would happily recommend Naomasa-san and his grapehouse to anyone that is interested! Great first experience in Tokyo!