Igor's apartment is a fair deal - it's well located, has plenty of space, and the bathroom is quite nice. Price was a deciding factor - you probably won't find better value for your buck.
We have found some issues with kitchen equipment, and the apartment doesn't have that much natural light, which I guess is a harsh reality for lots of people living in central Madrid.
Keep in mind that walls in the building are quite thin, so you'd prefer to party longer at the weekend rather than trying to get some sleep with Madrilenos having some fun well past midnight below you.