Tarkan is an amazing host who provides very detailed information about the apartment and Istanbul. The apartment is big, spacious with a modern yet rustic vibe. There were noise in the living room, but the bedroom's windows were really good in blocking out the noise.
However, there were a few things to take note:
1. The apartment is not that convenient to any tram or metro stations. The nearest is possibly Taksim Metro station (about 600m away, 12 mins walk). To get to the attractions (e.g. Sultanahmet, grand bazaar), you have to walk about 1km to get to karakoy tram station. For people carrying a lot of luggages, the roads are not smooth straight roads, so might be a problem. Will need to carry the luggages up a flight of stairs upon arriving at the apartment too.
2. Location is at the pub area, thus not advisable for families with kids as there are people smoking shisha and drinking right outside.
3. Air-conditioned is not in-built on the walls, but the portable kind. Will need a little effort to make it work. TV wasn't working.