I've stayed here before, and purposely chose this hotel again because of how wonderfully friendly, helpful and genuinely nice the staff are. That is that is the main reason to stay.
It's also in a great location in the back-streets of Beyoglu, downhill from Taksim and not too far from Istiklal/Galata tower. The hotel and rooms are quirky and very well decorated! It's like being in a museum or antique shop. The breakfasts are really good too.
This time I stayed in the room on the top floor of the main building. The room itself was nice, though a little hot (but there was air con). It was up a very narrow spiral staircase, which was a bit irritating, but not the end of the world.
Overall, I would recommend this hotel to anyone looking to stay in the Beyoglu/Taksim areas.