Tuba is an amazing host! She is extremely helpful and will go the extra mile for her guests (quite literally!) The place was very nice and clean with an arty vibe, the heating is super efficient (which is important in Istanbul in February), and it is well-located (in between Sishane and Taksim metro stations, 12 mins walk from each). Communication (all in English) was great, and Tuba will offer you plenty of tips and recommendations, and even a cup of coffee now and then :)
I strongly recommend this place, you'll be in good hands!