The apartment was as described and was excellent. Lofts can sometimes feel cramped because of low ceilings under the loft or in the loft but the high ceilings (at least 15') made it a complete non-issue and the unit felt spacious and open because of them. Sandra was responsive and easy to reach.
Bathroom is completely renovated with excellent water pressure and plenty of stable temperature hot water (might be the best shower in any unit I've stayed at in 30+ apartment stays in BA.
Lots of good places to eat right across the street with my favorite for breakfast and merienda being Cafe Lezama a block up the street. But I ate at La Popular, Club Social, Deluxe, Napoles, The Pizza, and Hierbabuena and they were all good. 1880 is less that a block away down Defensa when we wanted an old-fashioned parrilla steakhouse experience. Tons more restaurant options as you move towards Plaza Dorrego.
Only thing to keep in mind that this is a street facing unit and, while Ave Caseros doesn't really have a huge amount of noise, it's enough to make it hard to sleep if you are not used to city noise. I wear earplugs so it wasn't a problem but you need to be ready to deal with it.
It's not pre-pandemic San Telmo and neither I nor my local friends were comfortable walking far at night (in most of Buenos Aires for that matter) but Cabify was a cheap, easy alternative. Wasn't concerned with it during the day nearly as much. Tourists were only allowed back in Argentina a few days before I arrived so the tourist areas are only slowly getting back to normal.