The hotel is in a residential area. Parking in the Street is for residents only.
The two best options are:
1. Paid parking: Navigate to the "Koestraat parking" located at the Grote Haag 2 in Amersfoort. The charge is approximately 15 euro per day. From this carpark it's a 6 minute walk to the hotel.
2. Free parking (availability not guaranteed)
Navigate to the Rubensstraat and look for a spot in the area between the Johannes Bosboomstraat and the Gasthuislaan. Parking in the Johannes Bosboomstraat itself is for residents with permit only. From here it is about 5 minutes to walk to the hotel.
If you arrive on schiphol airport, you can buy a trainticket to station Amersfoort Centraal in the airport. Trains depart every 30 minutes during daytime and can take you eather directly to station Amersfoort without transfer or through station Utrecht Centraal where you should transfer.
Once arrived at station Amersfoort you could take a bus to the busstop "Hendrik van Viandenstraat". This will take you about 8 minutes and cost about 3 euro's per person. Tickets are available in the bus. Getting off the bus, enter the Willem van Mechelenstraat and walk 150 meter in southern direction. There you will find the entrance.
Coming from Schiphol Airport you could find a cab to Amersfoort at the cost of 75 to 125 euro. From station Amersfoort Centraal a taxi will charge you about 16 euro during daytime. At night a little bit more.