Overnight, the block for the Saturday you added
An overnight is a fixed eight hour block with both ends written into the confirmation, and it is EUR 2,500 for two guests with one therapist.
Overnight is a length, not a mood. Eight hours, a start written down and a finish written down, so that nobody is working it out at six in the morning. For two guests with one therapist it is EUR 2,500. With a therapist each it is EUR 5,760. A single guest with one therapist is EUR 1,250, and a single guest with two is EUR 2,880.
Why it belongs to the weekend rather than the week
An eight hour block ends when it ends, and a working morning does not care. On a Tuesday it is the wrong shape. On the Saturday a couple adds to the end of a trade week, with a Sunday flight in the afternoon and nothing before it, the block has room to finish properly. The page on the added weekend works through the arithmetic of that decision.
Eight hours is not eight hours of massage
This is the misreading that costs couples the most. The block holds sleep inside it, and a shower, and a conversation, and a stretch with the lamp off, and hands that come back later. Booked as an unbroken session it would be neither pleasant nor possible. Booked as a night, it lets the hours find their own shape.
Working backwards from the morning
Find whatever fixes the morning, a checkout or a train to the airport, and subtract eight hours. A block starting at eleven finishes at seven. One starting at midnight finishes at eight.
Half always goes ahead
Every eight hour block carries an advance half, with no exception for a returning client and none for a same day request. EUR 1,250 on the two guest figure is settled once the night is agreed, and the rest at the door. Give the night up and the notice scale in the booking terms decides what stays.