The care and hospitality offered by the company and the staff have been believed to be commendable even by Skytrax, the airline and airport review and ranking site.
Keep the physical boarding pass in case the flights do not credit to your ffp's.
The aisle and the normal window options come under this category.
Specific flight changes incur a change fee that you have to clear before confirming your itinerary changes.
Does Qatar Airways charge for seat selection? I can also select on the A350-900 reverse-herringbone in my itinerary.
And annoyingly does not allow you to proceed to pick seats etc.