Simple, its near to QATAR MUSEUM
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Al seef hotel is on the main road so you will not miss it
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Go straight on road where AL FARDAN CENTER and GOLD SOUQ are located. After them there will be one roundabout and then one signal. When u will cross that signal you will see AL SEEF HOTEL on your left (opposite road) and there will be one road entering next to it. There u will find MOFA bldg.