This is a nice studio apartment in an older, well-maintained building. The neighborhood is comfortable and convenient to transit. It was surprisingly quiet (a bit of street noise during the day but nothing through the walls from other residents). The internet connection was sufficient for email and reading, but I wasn't able to watch videos much (but no worse than my typical Buenos Aires experience).
Tincho was an excellent host. He arranged his schedule for my late Friday check-in (I hope he didn't miss out on anything too important!), and he offered flexibility on the check-out as well. His English language skills are excellent, and he kept in contact by SMS and WhatsApp, so I felt I could reach out whenever I needed local advice.
We discussed the "amenities" list on Airbnb, and you should be aware that there is no washer (or doorman!) in the building. There are commercial establishments nearby (common in Buenos Aires), but they have business hours so don't plan on doing your own laundry on Sunday or after 6pm.
I'd be happy to stay again and recommend it to others.