Hi;
1) All Business Class Cabin; Airbus 340-500
2) 11A/K seem to be quite private - but the forward and middle cabin tends to get filled up quite quickly. I tend to prefer seats 30A/K (bulkhead seat, so you can sleep at any angle you want) + quieter rear cabin!
3) They provide you noise-cancelling headphones - but feel free to bring your own
4) Universal power outlet as mentioned previously - 110V I think (feel free to correct me on this one!)
5) SAS Lounge