Not the most appealing sight when in need of sleep,an old hospital bed without a mattress

Booking.com told The Telegraph it was now in touch with the customer to look into what happened.

Mr Bradley told MailOnline: “We started saving up for this trip when Scotland first qualified. The first place we stayed was really nice.

“Then we arrived in Düren and the place we had booked was a mess.

“We were on the phone for three hours and eventually they said they would find us somewhere.”

Exposed industrial pipes aren't what most people look for when booking holiday accommodation

Mr Bradley said that Booking.com told the group one of the firm’s accommodation providers in the region would allow them to stay in a property which was not on its site,or on any other rental site.

Upon arrival he said: “We were stunned by what we found. Booking.com had sent us to a dungeon that must have been some sort of abandoned medical facility as there were hospital beds and industrial equipment lying around the entrance.”

He added: ‘We made our way into the property and we’re greeted by more industrial equipment,exposed chemicals,exposed cables and exposed pipes and to top it all off an axe that looked like something out of a murder film.

“The whole place had the vibes of a human trafficking horror film.”

Footage of the accommodation shows a dark room filled with hospital beds,industrial equipment,a shopping trolley and planks of wood. A set of stairs leads down to a tiled room filled with cabling and tools including an axe.

The footage shows other rooms with exposed pipes,open paint containers and jugs full of chemicals.

In some places you get complimentary tea and coffee,here you got an axe

Mr Bradley said: “The front door didn’t lock. We felt so unsafe. There were dozens of hospital beds and all these tools which could do serious damage to a person.

“We said there is no way we could stay there. We phoned Booking .com again but a different agent said it wasn’t company policy to source replacement accommodation.”

Mr Bradley and his friends found a hostel to stay in until they moved to the next city as part of the tour,but the four men were having to share one room and paying double the price they initially paid when they booked the holiday.

Booking.com was said to have offered the group a refund of up to £900,but despite this one of them was left with just £39 in his bank account after the emergency expense.

A Booking.com spokesman said: “This is not the experience we would want for anyone booking a stay on our platform. We are in touch with the customer so we can look into what happened and to make sure they are properly supported.”