Review by Tokyo Rocks
You can check Sushi Saito by watching Simon＆Martina's video on YouTube
You will probably have no luck by calling Sushi Saito to make a reservation. It's almost introduction only, so find a regular who can invite you or make a reservation for you.
Address: 1-4-5 Roppongi, Minato-ku, Tokyo (Ark Hill South Tower 1st floor)
(1 min walk from Tokyo Metro Roppongi-Itchome station)
Open: 12:00-14:00 17:00-23:00
Closed: Sun & Hol