Ecuador is one of the cheapest places in South America to learn Spanish. You can get private tutors for as less as 10$/hr. You can enroll for a class from within your hostel. Suggestion: One of the good hostels in Quito is the Backpacker’s hostel. It is right in downtown, you can learn Spanish with a tour guide registered with the hostel, they organize a free walking tour of the city every Wednesday at 10.30 am and they have a lot of activities to facilitate interaction with fellow travelers.