Just starting my planning so I hope you could give me some ideas before I begin reading all the great advice on this board. Would like to plan London/Paris for possibly September, 2019. Good time of year? We have been to Paris (2013) but not to London. Maybe 8-10 days in total.......Eurostar to get from one to the other. Any preference which we should fly to first? Have an idea where to stay in Paris.....what about London? Any tips or ideas would be appreciated.