Surfing is not learned in lessons, it is learned in the gaps between them, and the gaps have to be short. Come back the next morning and your body still remembers where its feet went. Come back next February and you are starting again, politely.
Staying at the house removes everything between you and the next session. No taxi to book, no alarm set for a beach half an hour away, no deciding at 6am whether it's worth it. You walk downstairs, someone tells you what the sea is doing, and you go.
It also means the same instructor sees you five days running. On day three they stop teaching you the pop-up and start fixing the specific thing you personally get wrong, which is the point at which coaching becomes worth paying for.