Silvia is a very nice person. No issues with communication, check-in or check-out.
The location is perfect, less than a 100 meters from Plaza Dorego. Lots of good restaurants around and San Telmo market one block away. Also lots of public transportation available.
About the apartment, it is on an old house. It was renovated but kept much of the original style. Do not expect too much; it is an old reasonably kept apartment.
One thing I really liked in the apartment is that it is absolutely silent. No noise from street or neighbors. I had some good night sleeps in it!