After retiring, my wife and I traveled to Europe. Our trip of 33 days took us to Bath, London, Brussels, Ghent, Paris, Colmar, Lyon, Milan, Lucca, Cinqueterre-monterosso-al-mare, Pisa, and Florence.
In each location we recorded where we lodged, ate, and what we did. Our average room rate is $67.00. These accommodations included kitchen, private bath and large bed.
A frugal traveler could do the same trip for an average of $30.00 to $40.00 per night. If you were to decide to prepare all your meals in your private kitchen, your costs of the vacation should not include food since you would eat even if you stayed on the couch at home.
Try it, it works!