Port Orleans Riverside
While I have also heard (but not experienced) about some 'issues' with cleanliness at Riverside, I have still preferred it to Coronado Springs. While I found the grounds at Coronado Springs to be modern and attractive, the 'feel' that we had there was more 'motel' like than I expected - and I did not get the full Disney feel - recall it is, at least in part, a 'convention' center. My biggest complaint at Coronado was noise - the layout of the rooms and the construction of the building makes for the transmission of a lot of noise in to the rooms (at least compared to what we've experienced at Riverside, or even Caribbean Beach, which I don't really care for much).
I think that the paths, bridges, water features, isolation, etc., all make Port Orleans Riverside more romantic than the other Moderates. Now, best of all would be if you could secure a discounted rate at Animal Kingdom Lodge. Since the first time we stayed there years ago we have not gone back to any moderate - we really got spoiled! (And the Yacht & Beach club is fantastic for EPCOT access and has its own charm, though even discounted it would most likely be way over-budget).
I hope you enjoy your stay wherever you end up - congratulations. :sohappy: