If you stay around Nagatacho / Akasaka area, this hotel can be recommended :)
The Prince Gallery Tokyo Kioicho ☆☆☆☆☆
https://www.marriott.com/en-us/hotels/tyolc-the-prince-gallery-tokyo-kioicho-a-luxury-collection-hotel/overview/?scid=f2ae0541-1279-4f24-b197-a979c79310b0
Here is some videos for your consideration. ( Videos from Youtube)
Security : Key is needed for the elevator for the guest rooms( the lobby floor / 36th floor).
Recommend meeting spot: We can meet in the lobby on the 36th floor. There is a quite large space and bunch of couches there.