Hello
1. Yes,you can get TomTom working on this.This unit can support TomTom map.Procedure and version is not special.This is the link about Android system for W204: http://www.seicane.com/android-mercedes-benz-c-class-w204-head-unit-dvd-player-gps-navigation-system-with-3g-wifi-radio-bluetooth-sia-9315
2. The DVD is installed in your car's glove box.You can play CD disc from your Audio20 head unit,and also can play DVD disc from the DVD player we provide.The 1 din DVD we sell is optional and it is part of the unit we sell.
3. The USB connection come out from the back of this unit.It is standard USB2.0 port.
4. No,can't fold down.
5. About the camera,please refer to the picture below.
6. Radio,CD,Bluetooth etc from Audio20 head unit.Others from this unit.This unit will keep all your original car's functions work.So it will not affect your original car's any functions after installation.
7. Yes,your original car's microphone for bluetoth will still work.
Thank you!
By
Seicane