If you want to visit the Palacio Real and other attractions in central Madrid, Matias' apartment is perfect for you. If you have a stroller or something similar with you, you may have difficulties getting in and out because the whole house is quite winding but that's not the Matias' fault. The only bad thing was that we run out of toilet paper but I'm sure this won't happen again, so we can recommend staying at Mathias' apartment!