You can try contacting them via the main Hilton number.

There are two buildings where they do check-ins and have staff working constantly. Each of these buildings has a public area. A lot of their spaces are outdoors, BUT the restaurant does have indoors dining. There is a bar (that I have not visited) on the property. The pool is a fun (and warm!) place where people can gather, but you need to book ahead as it is very popular. There are also many restaurants near by. You'll find many gathering places have outdoor spaces still open with outdoor heaters. Have a terrific time! I love Istanbul!

When getting a transfer to hotel, be aware that there are two separate parts of the Hagia Sofia Mansions. Try to find out which one you will be in. Also, the hotel is in the pedestrian area around the mosque, so a shuttle has to pick you up. Cars can't go directly to the door of the hotel. Other than that, it's great.

I don’t think so The hotel can arrange for a pick up or just Google it and there are some transport companies which will arrange for a car or van . Best is call the hotel direct and they can help

I normally call them for queries: 0090 212 912 42 12 They are always polite and helpful Good Luck