Guille was great- he was super communicative and flexible with both check in and check out.
His place was also fantastic- it was super clean, everything in it was new, and it was very well appointed. The location is also great; it's where Palermo, Collegiales, and Chacarita meet- leaving you with tons of options. Be sure to check out Salvaje Bakery and Strange Brewing while you're there.
The bed was large and very comfortable (it is quite firm, which we appreciated, but if you're the type of person who prefers a very soft bed it may not be to your taste). The shower was great with endless hot water. The internet was also quite capable (unfortunately I forgot to run a speedtest, but streaming and video calls were solid).
It is on the first floor (which is to say, the floor above the lobby), so there is a bit more noise than you'd get in a very tall building. However, the apartment is located on the backside of the building, away from the road, so that helps keep things pretty quiet.
Overall, it was a great place to stay, Guille was great to deal with, and we would absolutely stay there again!