We were 2 couples and we saw this apt on VRBO. The location is great as it is very close to the 3 big art museums and only a short walk to Plaza Mayor, Santa Ana and Puerto de Sol.
On this trip to Spain we found 4 of our apt stays through VRBO. I agree with gracie-boo that I have never stayed in a VRBO that was so empty. It is also in need of a little TLC. The kitchen cabinets are coming apart, the furniture and scatter rugs could use a good cleaning and the whole place needs a paint job.
The apt is large however it is likely better suited to adults and children than two couples as the second and third bedrooms are so tiny you need both of them to accommodate both people and luggage.