My husband and I stayed at Cube Suites for 7 nights. We are travelling for 6 months and both had large bags so we booked a room with a lounge for extra space, but it was still a little cramped.
Erol and his team are very dedicated to a great customer experience. They can help you with anything you need during your stay in Istanbul. We booked a great day tour around the city from here which we highly recommend as well as a not so great dinner on the bosphorous which we can't really recommend.
It was difficult for all our drivers to find as there is no signage out front. The only other negative is that the pillows could do with replacing.
Overall though, a great location, with great people, which is the most important thing.