I stayed in Arden special class hotel with my husband for our honeymoon in Istanbul. We really loved the fact that the hotel is well located, we never needed a taxi.
The architecture style is nice, the rooms are small but it doesn’t really matter if you are planning on staying out most of the time.
For a 4 stars hotel, everything was average, the service ( the more you tip the better it will get), English is not well spoken so it’s better to use google translation.
Housekeeping service needs to be improved, there were no warm blankets available, whenever we used a cup it was washed in the rooms toilet sink and put right back on the counter. We ended up buying dish soap and cleaning ourselves.
The breakfast is good, but serves the same thing every day which can be annoying for long stays like ours
All in all, I will still book in this hotel for its location. But better can be found of course.