Hello MN - we're on our first holiday abroad with our 10 month old. All's gone fairly smoothly so far but the AirBnB we've rented for our last night has provided a travel cot without a mattress. It's basically a thin base on top of the metal bars. I am very confident our princess and the pea sleeper will not stand for this madness.
AIBU (or unsafe, is actually my question) to put pillows under the base with the sheet on top? The base is still fairly firm and there's no loose bedding. The arrangements just a bit squishier.