I can't say enough wonderful things about Pilo and the room available in her home. Pilo is warm and friendly and has great recommendations from great restaurants to visit, to cool neighborhoods (Lastarria and Bellas Artes) and current must-see plays, as well as where to watch Cueca (Chilean national dance). The wifi works well, the apartment is in a safe neighborhood, the space is kept very tidy, and the porch provides a great view of the Cordillera-- I miss it already! The apartment is indeed a 5 minute walk from a subway station (which takes you to downtown and the local attractions in 15-20 min). It's within walking distance of an inexpensive supermarket (Lider Express), a small mall, and plenty of banks and ATMs (including Scotiabank which means no withdrawal fee if you have a Bank of America card!).
I would definitely recommend staying here!