Great question — answering as the UphillTech team:
The Keisei Limited Express departs Ueno and Nippori and costs 1030 Yen with an IC card. This journey will take about 70min. You can get to Ueno from Akasaka on the Ginza line in about 25min for 200 Yen. This is a good, cheap and fast option if you want to avoid buses.
Full answer by EdmundYeung99: https://travel.stackexchange.com/a/55881 (CC BY-SA 3.0).
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