We stayed in the Social's flat for four nights. Here are all the things we liked and things that we thought require some improvement.
We loved the location of the flat. It is central but very quiet at night. The windows face a green courtyard. Galata tower is just 5 minutes away and there are hundreds of cafes and restaurants there. There is a small local shop just two minutes walk from the flat. The flat is very clean and well equipped. The bed is comfortable. The air-conditioning really helps in hot weather.
There are a few things that can be better. Although there is a kitchenette in the flat, you would struggle to do your own cooking due to lack of equipment and absence of basic cooking ingredients, such as salt and sugar. Being experienced Airbnb travellers, we felt that this is not in the spirit of Airbnb. However, this did not affect our stay because Istanbul has so many places to eat that we were spoilt for choice. I don't think anyone would need to cook in Istanbul, unless you are on a very low budget.
Another thing that did not go very smooth was the check-in. Although there is a key lock box outside the flat, the host did not provide us with the code prior to our arrival and insisted that they meet us in the flat. We did not have the internet upon our arrival, so we could not inform the host that we were there and ended up waiting for him on the stairs. The same thing happened with the check out. The host insisted that they come and pick up the key from us but they did not turn up at the arranged time and after waiting for an hour, we just put the key in the lock box and left.
The host can provide a private transfer to/from the airport, they charge 50 euro (you can haggle as you do with everyone in Turkey). This can be convenient for some people, especially if you have a lot of luggage. We did not use them and got an equivalent of Uber taxi for 1/3 of the price.