I stayed during one month.
Karin and her staff were friendly and very helpful for all information. The late check-in and check-out were even accepted without extra fee.

The subway, bakery, vendors of meat and vegetable are just 2 minutes of walk.

The design of her hotel and the duplex studios is special, not like the local buildings. There are still constructions inside, so the noise is inevitable. The winter in Buenos Aires is especially cold in August. A more complete heating system of the room with sufficient and stable hot water for shower would be great. Meanwhile, a more stable WiFi with stronger signal would be perfect.

For tango travelers, there is a space in the hotel for rehearsal, though I don’t know how much the rent is. There is also a milonga in the hotel every Thursday night. There are buses to milongas of all directions. The subway (linea H) is almost at the door, which takes you to tango studios in different districts.

Just a remark, my duplex studio was overbooked during my first 3 nights, so I had to stay in Karin's private room. I finally got refund of 50% on my 3rd week. I hope the overbooking will not happen again to the future guests.

Thanks to Karin for the Belgian dinner on my last day!