Tatsuki's place is very good if you want a private room as a solo traveler. I just needed a place where I could throw down my stuff and unwind after a long day of traveling in my own privacy, and this was perfect. There was plenty of space in the room to leave my luggage wide open even with the futon fully laid out.
It's not the most spotless place but I wouldn't call it dirty either, it's very livable. The kitchen is very minimal though and lacking utensils or any cookware. A large sink and fridge is available however. Not the biggest issue as I'm sure most travellers would be eating from the huge varieties of food available just minutes away.
Location is great for transiting to other parts of Tokyo and I would pick this place again just because of this. Yamanote line is just minutes away.