The room type is "Private Room" this implies that it is a shared house. If you want to a non-shared house, then you need to look for room type "Entire House".
My family drop by for a quick visit on a Saturday night at around 9pm, for approx half an hour for a cup of tea. And it was while you were not home at the time. I only realized you were back I noticed your car in the car park when I went out again.
A normal course of action when someone is noisy is to ask them to quiet down.
Finally, your feed is a real surprise to me as your only communications after the checkin is an SMS
"Good morning Hoi,
Just letting you know that we will be staying at our relative's place next two nights.
We have left the keys and remote on the table inside the room.
My advice is, if you are in-happy in anyway, you need to let the host know so that the host rectify the problem. Also read and understand the room description, ask the host before you book. Also, if you are not happy to pay, then do an early checkout so that you get some refund.