The flat is exactly as described: the location is wonderful, it is super-quiet despite being a few yards from what might be the noisiest street corner in Buenos Aires, it is very stylishly and comfortably furnished and the WiFi is great.
However, there are some problems. The hot water is extremely unreliable, with every shower being an adventure. The stove also needs repair, and the kitchen is best described as basic. I expect Ago will fix these things (at least the stove and the hot water). It's also helpful to speak some Spanish as Maria Luise, who helps with the flat, speaks almost no english. However, she was very helpful when needed. These things said -- if you love San Telmo you will love this flat!