To those visiting Buenos Aires and especially for those visiting San Telmo this is the perfect spot! We were never had any issues with the street noise. We always sleep with a "white noise" app playing anyway :) The apartment layout is perfect and the kitchen is big enough to enjoy and actually use. We loved the antique dressers, china cabinet, vinyl record player, phone, etc... The strong wifi, super clean linens and rooms was a big plus for us.
Ivan is a great host. He welcomed us to his apartment with beverages, fruit, two sets of keys, and a cell phone & land-line to use. He was very hands off (unobtrusive) yet always an email message or phone call away. I would definitely use his apartment again and would most definitely recommend it to anyone :)