We had a nice stay at Gerardo's apartment. His place is very centrally located, a quick walk to Cerro San Cristobal, Patio Bellavista, Barrio Lastarria and the Baquedano metro station (L1 & L5 train lines.) One note for light sleepers: his flat is located near Pio Nono which is a big party street. (We are from NYC and are used to city sounds so we had no trouble getting to sleep at night.) You'll likely be sleepy from exploring Santiago all day anyway!