Basma's house is located near the Blue mosque and Agasofia (30 min walking, 15-20 min public transport) so it is very convenient and we got our own key to be free to go in and out at our pace. Basma is a pleasant host, she welcomed us with tea and cake at our arrival and was always ready to give us recommandations and indications (try the Yemeni restaurant nearby if you can!). She even let us leave our luggage after to check out because we were only leaving Istanbul in the evening. I recommand to stay at Basma's house if you're visiting Istanbul on a budget but want to be close to the main attractions!