From the hotel, walk back to the intersection, past the parking lot. You can take a bus to the city center from the bus lane in front of the hotel, at the 'Europaweg' bus stop. This is about a 5-minute walk.
Bus line 300 (towards Haarlem station, R-Net)
Departs every 10 minutes (from 05:46 A.M. to 01:01 A.M.)
From 01:01 A.M. every 15 minutes until 01:46 A.M.
From 01:46 A.M. every hour until 05:46 A.M.
Important: take the bus from the hotel side of the bus lane (the opposite side goes to Schiphol). This red bus stop is exclusively for bus line 300 (towards Haarlem station). This trip takes approximately 5-10 minutes (depending on the bridge).
Get off at the first red bus stop, Haarlem, Centrum/Verwulft (R-Net) bus stop.
* Note: times may vary due to traffic, holidays, etc. For current times, you can check this website.