I have been twice in this hotel for business. I haven't had breakfast there, because there are so many different food options nearby any time of the day. Good comfort for the price, most central location possible in the crossroads of two pedestrian streets and excellent WiFi which is important for my work.
The only minus is that in the street side rooms you hear the money exchange guys shouting from the morning: "cambio, cambio, dolares, euros, reales". But it's also nice to have any traffic sounds like in other streets.
For longer stays I prefer other areas of Buenos Aires than Microcentro, but for business visits this suits me perfectly.