I stayed with a friend for 18 days at Sebastián house and he was an amazing host, when we arrived at the house he left some snacks and drinks which was amazing after a long time on a flight.
The house is very well equipped with kitchen utilities, a coffee machine, a toaster, washing machine, and others so if you will spend a long day at the house it's very useful, during that time one day a week Valeria helped cleaning, changing the towels and changing bed clothes which helped us a lot since we had to work during the week and let us free time to enjoy the weekends.
I also spent all this time working there and I spend a long time on video calls which needs good internet and didn't have any problem this time.
About the house, it's very well located I felt safe walking along the streets and it's very close to walking to awesome restaurants, coffee shops, supermarkets, and subway stations. There is one "hidden restaurant" very close to the house called Kuda Omakase that is really worth the experience and also a coffee on the street that will impress the coffee lovers.
The only cons that I see are that the apartment is in the middle of other apartments and buildings so it was kinda dark but the lights fix it, another thing to consider is that at the time I went there some neighbors are doing home renovation didn't affect me since I use headphones to work so for those who need a really quiet place should check with Sebastian before reservation.
I really recommend that house for those who are visiting Buenos Aires, Palermo is a lovely place and for those who do not want to stay in a place full of tourists to just live the life as a local is an awesome option because there is a lot to find out by just walking around and Sebastian gave us all the assistance that we needed.