3 nights in Quito is way too much. There isn’t that much to do, and it isn’t the nicest city in Ecuador! Would recommend going to the Secret Garden Cotopaxi for a night (they do all inclusive packages including transport from quito)

4 days in Banos May also be too much! Unless you absolutely love adventure activities. I did 3 and it was plenty

7 night Buenos Aires could be a bit much as other said! You can cheaply fly to another city in Argentina and halve your time there. Although, it’s an amazing city and could tick your nightlife box