Just got back last week from 2 weeks over there.
With small children and just 7 days? I'd totally skip Kyoto and just stay in Tokyo. In Osaka and Kyoto, according to fitness apps, we were walking 8-12 miles a day. It was a lot better in Tokyo. Especially in Kyoto, strollers don't fit anywhere unless you've got a small umbrella one.
Had 6 nights in Tokyo. Still only hit half of the main stuff and felt rushed about it too. Stuff just takes way longer than you expect. Went into Yodabashi and thought it would be a quick in and out. Ended up in there for over 2 hours, before staying longer and eating lunch in there (another hour) for convenience and to save time trying to find a place outside.