The museum is located on the southern shore of Lake Sukhodolskoe (Suvanto-Jarve) just opposite the village Gromovo. WGS-84 coordinates are: N60.676337 E30.187528. Of course, it is better to get there by car, along the 'Sortovala' highway from St.Petersburg to settlement Petrovskoe, then to the north along the dirt road about 4 km.
The museum is private. It is open on Wednesday and Sunday from 10 am to 5 pm. Not for free. It costs about 300 rubles (2021)
The museum is located on the territory of the 'Dacha' country club - as they say, sometimes they let you in, sometimes they don't. It makes sense to call first. There is something to see...