A printable guide for new arrivals in Istanbul can be found here.
The Istiklal Caddesi, where the Swedish compound is located, is a pedestrian zone and thus not normally accessible by car, but it has good access to various forms of public transport:
Metro. The uppermost entrance to the Şişhane metro station lies right next to the compound. It is one of the stops on the Green Metro line M2 that commutes between Yenikapı in the southern part of the Old City and Osmanbey in the north.
Funicular. The Tünel is a subterranean funicular which connects the Istiklal Caddesi with the Karaköy harbour. Its upper station is located on the Tünel Meydan about 50 meters from the compound.
Tramway. There is a “nostalgic tramway” that commutes along the Istiklal Caddesi between Tünel Meydan and Taksim. The modern tramway net can be accessed in Karaköy, after the lower station of the Tünel.
Bus. Taksim square, which can be accessed by means of metro, “nostalgic tramway”, or a 20-minute walk along the Istiklal Caddesi, is a main hub of public transport and many buses pass by it.
Boat. From the Karaköy and Eminönü harbor areas, boats commute both within and to outside of the larger city areas.
All public transports in Istanbul, including boats, can be easily accessed with the Istanbul kart. The card costs 6 TL and can be bought and loaded at most major points of commuting. Fares for different rides vary between 2-4 TL.