I suspect your route will be different from mine given your location. German atc were very helpful to us vfr and it was a pleasure flying long distances across Germany.
Also have only flown into tempelhof last year but as long as you work out vfr entry and reporting points it all seemed pretty straightfoward.
Public transport is good in Berlin so would expect you would have no problem getting in from schoenefeld.
My experience of large airports in Europe with commercial traffic is that they are generally very friendly and you don't feel out of place in small ga craft. Not unusual to have a follow me car which is a great help on big fields you haven't visited before. Had one at tempelhof to guide to apron.
Pasted link to our thread last year below if it works.
http://www.pprune.org/private-flying...ce-needed.html