I had a great experience at Weiwei's place. I visited Madrid for a work-related trip. I contacted Weiwei late evening and she replied very quickly. Her studio is conveniently located in the heart of Madrid, walking distance from Porta del Sol and Atocha train station. The studio has a private bathroom and an equipped kitchen. The entrance was shared with other flats but I had no issue at all. Actually, as I single traveller in a new town, I felt safer. I would definitely recommend this place!