I went to Madrid with 3 other girlfriends and stayed at Carlos apartment. Everything was great! Super central and near metro stations. We always felt safe. The check in was easy as he has all the instructions. We had all the amenities we needed. (Sheets, towells..). There is air conditioned. The apartment has a lot of natural light and the building is really cute and has a vintage cute elevator. You also have a place to leave your luggage next to the building which is great! Would stay here again. ☺️