If you are looking for a central apartment, comfy and sparkling clean, that's the best choice! Rubens apartment, is in a very central location, less than a minute to plaza mayor! Spacious with everything you need, very clean and amazing mattress to sleep on! The bed is queen sized, maybe bigger, I am not sure, and the mattress is neither soft or hard, just amazing. You can't feel, if you are not sleeping alone, the other one... The pillows the same!
If I visit Madrid again I would choose that apartment!