Our stay at Cube Suites was awesome! We felt right at home given the amazing hospitality of Yusuf, Amir, and Erol. We were greeted with an offer for "chai" (Turkish black tea) and cookies, which were always available to the guests. The lobby area was fantastic, and we made some lifelong friends with other guests/travelers.
The rooms were quaint. Loved the shower, although one should be aware that the tub is high in terms of stepping into it. The room, although small, can accommodate quite a few people with the use of pull out chairs and a trundle type bed.
The location of Cube Suites was perfect. Although located on a steep hill, it was very easily walkable and in a dynamic neighborhood. For example, it is less than a 15min walk from SultanAhmet Square (i.e. home of the Hippodrome, Blue Mosque and Ayasophia, as well as access to the Big Bus and many amenities). The staff also helped me arrange a local hamam experience. However, there is a self haman space located in the basement of the building. Also, Istanbul is one of the largest and historically important Islamic cities in the world (boasting incredible mosques) - so you will hear prayer call from the minarets around around and city as early as 545a (this didn't even wake me after the first morning there).
Yusuf has multiple units available at Cube Suites. This is important to know in terms of any physical limitations that you might have, since one side of the building does not have an elevator, and you may have to walk as many as 5 flights of stairs if on the non-lift side of the building. Just make sure that you check which units are available when booking.