We loved Eyüp's apartment. It has a perfect location and it's really nicely decorated. The only thing I would say is the AC that doesn't climatise the room enough. However there is a fan to cool down the other side of the room from where the AC is. It works fine, but it's still only relatively chilly.
I gave a four star review not to the apartment but to the infrastructural issues that have become rather common in the neighborhood. There are lots of construction works taking place, which left us with muddy water in the shower, the sinks and the toilet for longer than a day. But as I mentioned, this is a possibility in all apartments located around Galata.