Lake Balaton is about 12 hours (1300 miles) from Utrecht, The Netherlands. The house is located in the village of Badacsonylábdihegy, northwest of the lake.
There are multiple routes leading to Hungary. Usually you will be entering from Vienna, Austria, at the city of Sopron, Hungary. From there it is about a 1.5 hour drive.
Alternative routes are south via Graz, Austria or even from Trieste in northeastern Italy. Or what do you say to continue your holiday after Balaton there or in Croatia It is only 4.5 to 5 hours away.
Of course you can also fly. Fly to Budapest is the most logical. Drom the airport it is about 2 hours drive to Lake Balaton. Vienna or Graz are good alternatives.