Oscar's place was perfect perfect for the price. It is in the Latina area which is a great area in Madrid, close to everything. You can walk to three metro stations (La Latina, Anton Martin, Tirso de Molina) in less then 5 mins. You are less than 10 mins from Sol, Museo Reina Sofia, Atocha train station and so many other places.
The apt itself is fairly small. But that is exactly what we were looking for. It's the definition of cozy, perfect for a couple. In my opinion, you can only have two people staying here. There is even a kitchen, but why would you even cook if you are in Madrid! While we were staying, there was construction going on. But not a big deal because we would only be at the apt to sleep. Do note that the walls are thin. You can hear the neighbors. But this is a common complaint throughout apartments in central Madrid. If you are a light sleeper, bring ear plugs.
Oscar was a phenomenal host. He was always in communication with us. We arrived early morning and he was able to have the apt ready and clean for us. Extremely nice person. Throughout our stay, he would send us messages with recommendations and things we could do. When we left, I forgot something at his apt. Luckily I was coming back to Madrid and he took time out of his day to meet me at the train station to give me back what I had forgotten!
I highly recommend Oscar's place.