I really enjoyed staying in this apartment. I loved the area: It is not really touristy but still not far from the Estacio Nord, a beautiful park and a market. Many nice restaurants and shops nearby. Also, the apartment itself was really good. Clean and everything provided that is needed (besides salt, pepper and oil). The WiFi worked perfectly fine and I never had any problems during remote working. Also the air condition worked without any issues.
There was only one issue with the sink in the shower but SingularStays fixed it already the very next day.
In general the apartment was very clean.
Please note that the building is located at a big street, so if you are sensitive to noise, keep this in mind.
It seems that there were many international people in this building. There is a big shared rooftop terrace (with a grill, many seating areas, a nice view) and events you could join but there was never a problem with noisy neighbors.
Signal result: Would definitely come back!