I stayed by myself at the tatami room on the 2nd floor for 2 nights during December.
Walking from the nearest station to the Dat's place was very easy since it's basically just a straight line and like maybe 6 or 7 minutes away. I did an early self check-in without any problems since Dat gave me very precise instructions. This was my first time sleeping in a tatami room and I must say I was surprised at how comfortable it was. Even though there was no aircon, I was provided with a portable heater which did the trick to keep me warm. Also, I really appreciate all the small details all around the place with labels and instructions which made it super easy to familiarize with the house. The hosts were also very quick to answer any question or message.
I 100% recommend Dat's place for those who want a quiet and tranquil stay in Tokyo.