If Napoleon could get there, so can we.
I wonder what Berlin looks like in the summer, but maybe it would be hot. Travelling in the winter has the advantage of adding clothing while bustling about instead of roasting and sweating thru beautiful gardens. AND there isn't air conditioning in much of Europe. Very little HVAC industry. If we wanted fresh air in our hostel room, we opened the window. AND Berlin was full of Turkish people who make BRILLIANT food for our 3rd annual Turkish Thanksgiving dinner.