This sounds like a fantastic opportunity to lease a property in an exceptional location. The fact that it is situated on the main road to Kedungu beach with Balinese house gives it an authentic feel, which is what many travelers seek when visiting Bali. The convenience of only a 5-minute walk to the beach is sure to attract many guests.
The asking price of IDR 2 Billion for a 20-year lease is a reasonable offer, and I would suggest negotiating with the owner to explore any potential flexibility. It would also be wise to conduct a site visit to the property and examine the lease agreement thoroughly before making any final decisions. If all proves to be in order, this property could be a valuable investment for those seeking to create a memorable and profitable venture in Bali.