Mavi Guesthouse (Hostel) -
Ishakpasa Cad. Kutlugun Sok. No:334400 Istanbul Turkey
The metro from the airport runs from 7am until midnight, catch this and get off at the Aksaray stop. From Aksaray metro stop walk to Yusufpasa tram stop (300 metres approx.) then get a tram to the Sultanahmet stop (old city).
Mavi Guesthouse is a short walk away.
From the Bus station take a metro to Aksaray then take a tram to Sultanahmet area, we are a short walk away.