Subway:

3 at Grand Army Plaza and walk down

OR

F to 15 St- Prospect Park and walk up

to the Picnic House Entrance

Taxi:

to 95 Prospect Park West

Train:

To Grand Central or Penn Station, then use Google Maps

Plane:

Fly to JFK or LGA then use Google Maps

We recommend Air BnB to find a place. They often have the closest and most affordable options (especially if you go in on a place with a friend or two)