My girlfriend and I had to stay an unplanned extra week in Istanbul, going from vacations mode to working remotely. Thus, we stayed in the appartment most of the time, and had a "normal" (a.k.a. not very tourist-activities oriented) lifestyle there.
# Remote work conditions:
The offer boasts fast internet, and the big table with seats looked fine for both of us to work with our laptops.

Wifi:
While the internet was great (probably the best we had across our 4 different stays in Istanbul so far?), a speed test clocked at 18mb/s. That was enough to have netflix on + 1 video call, but 2 video calls + netflix was pushing the wifi to the max. Eh, I guess if you are really working you don't need Netflix anyways.
Seats:
First, it is nice to have a proper table in an AirBnb ! Most of the other offers had either low or small tables, that was not the case here, and enough for both of us to work with laptops. The seatings were fine (wooden chair), even though I needed to use the provided cushion by the end of the day if I did not walk enough.
Unexpected plus, the neighborhood:
The neighborhood is simply incredible !
There are many coffees and restaurant from which you can either work from, or just pick up food. With the low Lira, they were very affordable and it was a no-brainer to just take a 3mn walk instead of cooking. My favorite was Cuppa coffee, which is a great place to hang out all day if not too busy.
It was also incredibly quite during the day, with barely no car passing in the street (that can be a hit/miss)
# Regular living
Kitchen:
The kitchen is very well equipped, and we never found ourselves lacking anything. We were even able to make dumplings. The chef knife was also well polished, which was a surprise after being used to dull Airbnb knifes. There was also a traditional tea machine, which is in all ways superior to how we make tea in Western Europe.
Bedroom:
The bedroom is not very big, and the bed is on the smaller side. However, we found it to be enough. The bedroom being incredibly quite, I had my best nights of sleep in Istanbul.
However, there is plenty of space to store clothes.
Groceries:
There are small shops <2 mn distance from the appartment. We prefered going to the slightly further (5mn?) Carrefour gourmet, which is big and yet with higher quality goods.
Walking around:
The appartment is in a hilly neighborhood, so expect to walk up and down a bunch.
To take a stroll, the bosphorus is 5mn-ish away, which was nice for lunch walks.
As said above, the neighborhood is EXTREMELY (among the best neighborhoods I've ever been in) well furnished in restaurants/coffees. 2 other favorites are Juste Fried Chicken for ... fried chicken, and Noly for pasteries.
Overall, we absolutely loved the appartment. It really felt like home, and made me appreciate Istanbul way more. I could see myself live there.