Ivos is an excellent host. Very responsive and helpful. Location is very close to the rail line and simple to get there from the airport. It took us no time to get orientated. Suggest that you get a Berlin Welcome card at the airport giving you access to all transport. Take the add on cost to museums. Loved the Reichstag tour but book this lots of time in advance. Way better than just going up the viewing dome. Potsdam is well worth a visit. Again just hop on the train 150m away.