Im taking the wife in July but just for one night (I dont want to spoil her) then we are off to Paris and Barcelona. I have booked the Hilton Diagonal Mar in BCN but am not sure what I should do in London and Paris. By that time I will drop to HH-Gold but will still have SPG-Plat and plenty of points in each to burn (but would prefer to use as little as possible). Where would you stay in CDG (2 nights) and LHR (1 night)?