Antique is a cozy place with an unbeatable location, very close to what I wanted to visit: the Blue Mosque and Hagia Sophia. I spent less than 24 hours in the city, so I had this minimum program.
The room was clean, the bed comfortable and the breakfast good. The guys at the reception are very helpful, over the internet (answering all my questions quickly and preparing my transfer from the airport) and in person (giving good advice about everything around).
I loved my short stay and will come back, as there's a lot yet to be seen in Istanbul.
Many thanks, guys!