Trefcentrum Delfstede can be easily reached, both by car as well as by public transport. The centre of Delft is just a 5 minute walk away.
Delft is easily reached by train. You should go to Delft Central station. From there you can either walk or take the tram. For more info see the NS website.
You can also use tramline 1 that runs between Delft and The Hague. Use stop Prinsenhof which is almost directly in front of the building. For more info see the HTM website.
Delft is located between Rotterdam and The Hague. Take exit Delft Noord of the A13 and follow the Vrijenbanse Laan which will bring you via the Wateringse Vest to the Phoenixstraat.
It is just a 10 minute walk from Delft Central Station. Please follow the tracks in the direction of the Hague. Delftstede is on your right hand, just before you reach the mill.
The parking space in front of the door is just for loading and unloading. You can also park across the street below the railway viaduct. However, most is this is (very expensive) paid parking (Dfl 4,0 per 54 minutes), so please watch the signs.
If you are lucky can can park your car in one of the streets behind the railway viaduct. This area is free for now, but will soon be changed into a permit-only area.
You can also park in the parking garage Phoenixstraat which is next to the ING bank. Parking here is less expensive (Dfl 2,75 per 57 minutes of Dfl 15,50 per day).
For more info see this city council website.