Sunday and Friday airport girls.. Thursday insomnia.. The other days gonna be Aston and Anni porche.. By the way is there any sight seeing over there 
Good plan although if you could do it, better to leave 1to1 scheme such as Aston on your last day after all of energy drained in the party.
Regarding combining Punting and sightseeing, Berlin is a great city, especially if you are interested in the WW2, Communism and Jews concentration camp history.
For the start up for those who have not been to berlin quite often, you could join the free walking tour
External Link/Members OnlyThe tour guidance is in English, It runs every day 10.00 to around 13.00. The free tour relies on tips given by the participants. Many people tips around EUR 10.00. If you google it in TripAdvisor many positive feedback regarding this tour, so it is worthy. This is an example
External Link/Members OnlyAfter that you could take their other paid tours, which moistly cost less than EUR15.00.