I would recommend VIncente’s place.
It is a modern, light filled and very well equipped flat on the sixth floor of a contemporary apartment building. There is a 24 hour a day porter and a laundry on the 23rd floor of a sister building. The pool wasn’t open when we were there in November but I think this was because it was too early in the season rather than because there was a problem with the pool.
The flat has beautiful double height floor to ceiling windows which means it was light and bright at all times but also means a certain level of noise from the street below and that the apartment does get quite dusty. On the other hand the views are good. and the activities of the neighbours in the flat opposite are endlessly entertaining.
The apartment is well located and within walking distance of everywhere one might want to visit. It is situated midway between two metro stations but we only used the metro for trips out of the city because Santiago is so walkable. We travelled to Santiago from São Paulo and in terms of safety they are worlds apart. We never felt threatened in Santiago and didn’t witness or experience any street crime in the time we were there.
We loved Barrio Lastarria which is a 10 minute walk away and is full of cafes, bars and restaurants.
I went running in the Park Forestall everyday which is 5 minutes walk away and beautiful. The Museo de Arte Contemporaneous which fronts the Park Forestall is well worth a visit and has a good and inexpensive cafe.
We really enjoyed visiting Barrio Italy (15 minutes walk) and Barrio Yungay (30 minute walk). The Strawberry Tours walking tours of the centre and Barrio Yungay are very well worth doing. Barrio Yungay is full of beautiful colourful colonial buildings which have survived the earthquakes and the street art and graffiti is amazing.
The central market is very lively and the fruit and vegetables there very cheap - the fruit juices are glorious.