Eyüp's place is a great setup in the Galata area, suitable for solo travelers or a couple. Let's first cover the fine print: The indoor space itself is about studio-sized, with the outdoor space measuring out to be only slightly smaller than the inside (maybe 40-55% of the actual floorplan in total). Wifi was a bit underpowered for say, Zoom calls while surfing the web, but was consistent and never completely died out over the course of my trip. The unit itself is the roof-level portion of a split duplex, so there is a stairwell leading downstairs, albeit locked. The reason I mention this was that noise traveled pretty well up into my unit from downstairs. This was only a problem on my first and second nights and Eyüp let me know they had already purchased soundproofing equipment, so this may likely be a solved issue by the time you read this post.
There's a small table inside where you can sit a laptop and mouse if you need to work indoors, but outside of inclement weather I did a lot of my work outdoors. Speaking of outdoors, please be aware that this is still a residential neighborhood with a lot of Turkish folks that need to work in the morning; you won't hear very much noise on the block late and night and Galata's buildings are pretty close together, so learn from my mistake and avoid becoming "that guy" by having guests up on the balcony too late or too loudly.
I know I mentioned the balcony/terrace a lot, but it REALLY makes this apartment, almost to a fault: I've been all over Istanbul in the last few weeks, eating and touring at a lot of places famous for their views, but none of them quite compare to the jaw-dropping sunrises and sunsets you'll get staying here. All of Istanbul's most noteworthy sites are practically laid at your feet, and I personally spent hours working with the sounds of Galata as my backdrop, or taking naps while watching the ships pass through the Bosphorus.
Eyüp himself is a fantastic host - I forget at the time of writing if he is a Superhost, but if not, he's a Superhost in the making for sure! He was extremely friendly and forthright about all of my questions or concerns (including everything posted above) and had no problem, and was always on standby to assist with issues. Even now I still ask him for advice or help regarding settling into Istanbul, and he's nothing but genuine and helpful. Mehmet, who helps Eyüp manage the building and the (must-visit) private hammam next door, doesn't speak a ton of English, but nonetheless went out of his wait to help me whenever he could.
The location is pretty great too. Naturally, you have to be somewhat close to the water for the views Eyüp's unit has, but I didn't expect Galata, Beyoglu, and Taksim to be in such close proximity! Some travels are going to require an uphill climb, but you can say that about the vast majority of Istanbul. The food and shopping in the area are fantastic (my favorite shop for sunglasses and Karakoy Marmaris, my favorite kebab spot are both located within a lazy walk), and like in most of Istanbul, you can find trendy Gram-worthy joints and more traditional established fare located right next to one another.
All in all, if you don't need a huge amount of space or lightning-fast wifi, there's no better choice in Galata than this property. A great intro to Istanbul, and as I transition to long-term living here, it's definitely a place I'll recommend to friends visiting the city or considering it!