I stayed at Tuğba & Aytaç’s place for around a month during my trip to Istanbul and found their place really amazing. They live in the same building which means they are immediately available to resolve any issues that tenants might have. The apartment has been nicely furnished with all the amenities, cooking utensils and equipments anyone might need for a long-term stay. They also had the apartment cleaned and sheets changed every week free of charge and it was spotless after that. They were also quite friendly with me and shared useful tips which helped me explore Istanbul. Since the apartment is on the 4th floor (with an amazing terrace/balcony and view), you might want to have someone with you to help you carry your luggage on the staircase.