If you come in from Schiphol by bus, the #397 is, as described, the most useful and least pricey transport. Get a travel pass at the airport; they are good for most of the transport choices. The #397 terminates on either east or west side of Marnixstraat (depending on the completion of the new bus terminal). Walk north to busy DeClercqstraat, go left across the canal and continue west across Nassuakade to quiet little DeCostastraat, go left. Cross a round park of plane trees and you are in Allard Piersonstraat; 1A is on the right.
There is a steep staircase; if you are unused to stairs, hold a banister and don't carry any object at first that will impede your progress. The apartment is tastefully decorated and comfortable. Some expert art and decoration has been drawn from the Indian subcontinent, Indonesia and the Orient. I felt a measure of sheng fui had been employed in the design. The appliance and heating settings will be explained to you. Got laundry? there is a friendly washer place on DeClerzqstraat. Unless you are an Olympic figure skater, wear rubber shower shoes in the shower kiosk; the floor is slippery when wet. When you go out for the day be sure to turn off electrical items and reduce the thermostat; Amsterdam doesn't give away electricity. Don't walk in the bicycle lanes, there is neither comfort nor mercy for you there!