The apartment is a good value and the host is amazingly gracious and helpful.
From a public transport standpoint, bus is the only truly easily accessible option. But the bus is only 50 steps from the front door and does help connect to the main sights. The big downside was the time the buses take…because they seem to stop at every 3 minute distance (driving at speed limit). Think it took 40 minutes to reach Puerta del Sol. But, when I was not up for a long ride, I was usually able to grab Uber or similar for 14-17 Euros from most main attraction locations.
The apartment decor is a bit dated but everything functions well and very spacious. Having a supermarket across the street was also extremely convenient.
Overall, the stay was a positive experience.