We stayed at Christian & Felix's place for two weeks. It was perfect for us because we walked everywhere. You can walk to a variety of tourist spots within 1 kilometer. The restaurants are plenty and varied. To catch a taxi, just walk <5 min to Plaza de Tirso de Molina or Uber. The space was comfortable. I was by the quality of the sleeping accommodations. The place is stocked everything need. It is clean, light and spacious. The The Rastro takes place on Sunday just the street. The very best Japanese restaurant is immediately across the way. Vegan, ethnic, tapas, and reservation only restaurants are within 10 min of walking. The place is two flights up, but it's manageable. The building is secure and check-in is easy. The neighborhood is eccentric but safe to navigate. Our hosts were attentive and accommodating. We wouldn't have changed a thing.