7-day or 14-day?

Hi! I am sure you have answered this question a million times, but I would like to confirm my itinerary. For the below, do you think it's wise to get a 7-day or 14-day pass?

Sept. 20-24: Tokyo (4 days)
Sept. 24-27: Kyoto (3 days)
Sept. 27-29: Osaka (2 days)
Sept. 29-30: Tokyo (1 day)

I've heard that you can use Suica or Pasmo in Tokyo so I'm wondering if it is better to choose the 7-day pass if we are realistically only going to use it for Kyoto/Osaka traveling. What do you think? What is the most economical choice? We aren't against buying the 14-day pass, but I wonder if it's necessary if we can get around with Tokyo without it.

We are flying in and out of Tokyo -- is it cheap to get to/from the airport with Suica/Pasmo?

Thank you so much!