We stayed 6 nights at Nicolas' place and we were extremely happy with it. Very clean, great location and mostly quite peaceful despite being in the middle of town. We never met Nicolas but communicated with him online and he was always very responsive every time we had a request or question. I would stay there again if I were to return to Santiago. There were just two small issues that I would raise: firstly, there was a crazy loud party in the next building along on a Saturday night which ended at 1:30 am - nothing to do with the block the apartment was in, but it was so loud we could hear it from our bedroom and apparently licenses are issued for late night parties like that in Santiago and this is considered normal. Woah, okay, I accept that the laws in Chile are not the same in my country, but I was surprised this is allowed and if you're staying on a Saturday night, you'll need ear plugs. Secondly, we had a random mix of reaction from the security guards downstairs - sometimes they were so polite and friendly, other times they challenged me as if I was some kind of intruder or deliveryman who had no right to be there. The security staff did that all in Spanish of course and thankfully I speak some Spanish, but this could be an issue if you don't speak Spanish and some angry security guard starts challenging you in Spanish when you just wanna get back to the apartment.