An undercover investigation of London’s hotels has unearthed what could be one of the most ridiculously tiny hotel rooms in the world.

The Corbigoe Hotel in Westminster, central London, offers a minuscule room that barely fits a single bed, and where the bathroom is so small you can wash your hands while still sitting on the toilet.

And while the room is smaller than a prison cell, it’s not that much of a bargain, priced at a fairly steep $70 a night during the April to October high season.

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The hotel room investigation by U.K. consumer group Which? found while the tiny room is advertised on Booking.com as measuring five square meters, almost half of that is taken up by the bathroom.

“When we visited with a tape measure, we found that the bedroom sized up at just three square meters — meaning 40 percent of that is the bathroom,” Which? said in its report.

“The rectangular box is almost completely taken up by a narrow single bed, from which you can simultaneously touch the walls on either side.

“The only window opens into the interior landing and the en suite is so small you can wash your hands while still sat on the loo.”

The Which? report said the size of the room was roughly half that of a standard parking space in the U.K., which is about 11 square meters.

“It’s also smaller than the recommended minimum for a U.K. prison cell — seven square meters,” the report read.

“Book through the Corbigoe Hotel’s website and this may come as a shock: no dimensions are listed and there are images for almost every other room, bar this one.”

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On the plus side, the room is a stone’s throw from some of London’s most iconic attractions, including Buckingham Palace, Big Ben, Westminster Abbey and the Tate Britain gallery, and right near Pimlico Tube station. But reviews aren’t great for that room.

“Do not book room 19. The room is no wider than a narrow bed,” a traveler from Spain wrote on Booking.com.

“There is no external window. You can either put your suitcase on the floor or on the bed. If your suitcase in on the floor you cannot get to the so-called ‘bathroom.'”

Another traveler, from the U.K., wrote: “Every movement has to be planned out in advance.”

“Do not book room 19. The room is no wider than a narrow bed,” one traveler wrote in a review. (Which?)

Someone else wrote: “It was so small I could hardly even turn around! The small piece of carpet I had was dirty and there was a smell in the room possibly the carpet and bed cover. The bed was ancient. I was literally in a stair cupboard.”

The hotel has an overall rating of 5.1 out of 10 on Booking.com, which is considered “passable."

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The Which? report focused on the rise of “micro” hotels, where basic, compact lodgings are offered for travelers who don’t need the space and comforts of traditional hotels. But its investigation found many of them weren’t worth the cheaper prices — especially when they ended up being even smaller than they appeared in photos on the booking site.

“Hotels need to be completely upfront with customers about just how small their rooms are at the time of booking, so guests don’t unexpectedly find themselves in a shoebox,” Which? travel editor Rory Boland wrote.

“Micro hotel rooms can be great for a short stay, but don’t assume you’re always getting a micro price.

“In truth, you’ll probably find a more spacious stay nearby for a better price.”

This article originally appeared on News.com.au.