Santiago is a classic South American city with plenty to see and do, and good weather through most of the year. It’s also a popular stop of the way to other Chilean cities where you can see more colonial influence or participate in outdoor activities.
Also typical for South America is that Santiago can be quite a cheap destination for those on a limited budget who are willing to eat and drink like the locals. If you insist on an English-language menu and familiar foods from home then prices jump way up.
Hotels in Santiago have a wide range of prices, so those who are comfortable in hostels or basic hotels can find very appealing prices, while those who need more luxury won’t find things to be such a bargain.
Attractions and transportation are quite reasonable as well, so it’s not difficult to do everything on your list while staying on a modest budget.