There are so many ways to save while traveling. While I've never spent time in an Air BNB or done any couch surfing, I've stayed in a lot of hostels. I think its a blessing that at my age I'm still able to stay in hostels with all kinds of young people. What is this? A decommissioned naval vessel that is now a hostel. If I can find a hostel I usually stay longer. I stayed 5 days here and paid USD100 in total, had my own cabin and shower.This was Turku in Finland. I'd do it again.