Hello,
I am in Baños now and took a cab from Quito. The cab will cost you $80 if you negotiate well. As far as wifi outside of your accommodations, I have not found any except at restaurants and cafés and of course they want you to eat there. There are quite a few tourists and English speakers here, but it might be tough to get from Quito to Banos with no Spanish at all.
My flight also arrived late (after 11pm) and I chose to stay a night in Quito and then took a cab in the morning. You may be able to go straight to Banos from the airport, as the cab driver may want your money, but I have had cab drivers fall asleep while driving so late.
I hope you have a great trip!!
