Ruben's place was excellent--the location was absolutely perfect being just a couple of blocks from Salvador metro. The neighbourhood feels safe and is easy to navigate. It also felt quite safe in the apartment itself because of the 24-hour concierge (and the doormen were very nice and helpful!). Ruben was also a super host, very friendly, accommodating, and responded extremely quickly to all messages.
The only downsides that have been mentioned by others are the internet being a bit slow/hard to catch and it was slightly noisy from being on the main street (Avenida Providencia). I was not that bothered by the noise personally (and Ruben provided earplugs!), but I could imagine that if you were a light sleeper, it could be a bit loud. Ruben also mentioned that he is thinking to improve the internet, so that would be great.
Overall, I would not hesitate to recommend staying here--it was basically exactly as described in the listing and had everything that one needs, even for a long-term stay (I was there for a month).
Gracias por todo, Ruben, y fue un gusto a concerte!!