I was there a few years ago! Awesome.
Great, glad you got to visit there. Not questioning your choices, but did you know that Akihabara is only two stops away from Tokyo station via Yamanote Line? Personally, I do anything to avoid taking taxis in Japan. Often, unavoidable, but still.
Did you buy anything?
Wow, every step is painful! Many people would have just stayed in the hotel room. You, sir, are a true audio trooper.