The ESSHC2020 will take place in Leiden. The sessions will be held at Leiden University around the Witte Singel and the Lipsius Building.
The General Meeting and reception will be held at the Pieterskerk which is in the same part of town.
Leiden is easy to reach from Schiphol Airport. The Intercity takes only 16 minutes. (For comparison Amsterdam Central Station with Intercity Direct is 14 minutes from Schiphol). The Sprinter (what's in a name) 24 minutes.
Leiden is a very walkable city. From Leiden central station to the Lipsius Building is a 15 minute walk.