Hey it's called Toronomon Hills for a reason. For at least one subway station (the one that's close to a more commercial area, I would guess south or southwest of the hotel), it's flat, but for a different subway station, you must walk uphill. I'm not claiming that you must climb stairs, but there are sidewalks near the hotel that are definitely not flat. It's somewhat downhill to the tower and even more to the Prince Tower (?) hotel and the big shrine a bit beyond it. It's uphill to the major street that you could access through the Atago shrine stairs. There's a subway station along that street (sorry I don't know the names of stations/lines from memory). The hotel is built on a hill, and "ground" level on the backside is several floors above where you enter the hotel at ground level by taxi.