My mum (senior) and I had a great 5-nights-stay at Mar's apartment. The flat is spacious, super comfy and clean, well situated (near shops, restaurants and public transportation), at walkable distance from every point of interest in Madrid center, in a safe and nice area. Easy communication with Mar, who is a perfect host: very welcoming, she gave us a lot of information and suggestions. Great value and highly recommended stay at her place.