We did not meet Olga.
She gave me an address of a different house she also rents (dark, in the middle of the village with a very small swimming-pool).
So we were furious ! Finally we changed and arrived in the flat we wanted, in the middle of the mountains, the one that matches with the pictures. And when we arrived there was no hot water :(
The swimming pool was not heated (=cold in May) and the breakfast was not a real one, but the view is just superb !