A private space for friends

So we are a group of 3- 2f and 1m. We are 3rd year btech and we want to have a sitting. We have a budget of 6k together and want to find a private space or cabin like where no on can disturb us and no surprise people knocking our room...we just want to chill for 6-7 hours and then go back home by night...any place recommendations?