I went to Sumo Cat hostel in March as I was in Istanbul on vacation by myself.The staff was really professional and friendly and helped me get acquainted with the city. When I arrived they even had some lunch for me, which was yummy. The staff at Sumo Cat truly helped make my stay in Istanbul awesome. I asked them all my questions about the best places to see and I even made some new international friends at a mixer they had. I highly recommend this place to anyone especially solo travelers, you will definately make friends if you're staying at Sumo Cat! Loved it!