I had a mixed experience here.
First, I'll list the good. The rooms and location are well priced, beautiful, and clean, I really enjoyed the room. The host-Alex and I had a great long conversation and he helped me with a map, a list of restaurants (follow this list- its great) and a recommendation for museum (which was also great). He invited me out with him. The location is close to San Telmo which I enjoyed. I also appreciated that the room had a fan.
Next the bad, check in was a nightmare. I made my reservation for the 24th and check in time at 11pm. It was confirmed. When I pressed "get directions" it took me to a location down the street from the reservation, which was confusing. I went to this location and knocked on the door. No one came out. I tried to call the number listed on the reservation, it was a non US and non Argentinian number so I couldn't call it. I went to the location listed on the reservation and rang the bell and banged on the door for 20 minutes. No one came out. Luckily my uber driver was great and didn't want to leave me there and took me to another hostel. I had to find another hostel last minute at midnight (stayed at a dump and had to walk through a not so good area). I finally had WiFi and messaged the host, in the morning the house sitters responded that they waited up for me till 2 am. I guess the door bell was broken. They provided their Argentinian number but it had a digit missing and they did not respond to my emails! I walked to the listing hoping for the best and finally got in.
WiFi was also spotty but restarting my phone helped. Finally, this location while close to San Telmo is also close to a dangerous area and the cities red light district, but I never had any problems as a woman traveling alone. I was told to avoid crossing Av. San Juan.