Many architecture and interiors magazines often mention a property's flow.
How one space flows into the next, how rooms are connected and the journey through a house is vitally important to not only create a sense of space but also effortless movement and visual connection.
In other words, why are there walls and doors in the way of your travel through a house, blocking sight lines and creating a strange and irritating pathway through the rooms?
READ MORE: Homes Under The Hammer's Martin Roberts shocked by 'house of horrors' that poisons its new owner
This terrace in Trebanog in the Rhondda Fawr valley was a property that really puzzled Homes Under The Hammer presenter Martin Roberts when he was having a roam around it before it went to auction.
The central hall and staircase split the reception rooms, so each become a corridor to a small inner room at the back where a crowd of doors had him calling the layout 'weird'.
There were five in this small space - two reception rooms, a door to the kitchen at the rear, a door to the under stairs cupboard and a door that turned out to be a surprise extra cloakroom.
Although impressed with the space on offer at this three-bed house, the way it was laid out was irritating Martin, the distinct lack of flow was obvious.
Martin comments: "Now that is getting weird, what is going on here? Got all these doors, got a downstairs loo, under stairs cupboard - wow, I thought I'd seen it all when it comes to terrace properties, but no. This one's definitely way weird!"
But what was also obvious was the incredible view from the rear garden and the kitchen sink that made going around the houses, literally, to get to them totally worth it; stunning.
The condition of the house was not too bad with the main jobs seeming to be some damp upstairs, a dodgy chimney, some guttering to replace and the garden to make into a welcoming space.
Cosmetic upgrades here and there too, and although Martin would love to have wielded a sledgehammer, it was probably not cost-effective if a new owner was going to flip or rent the terrace.
The house went to auction for £40,000 and was secured for £42,000 by naughty new owner Neil - naughty because he broke one of HUTH's golden rules - he bought it without visiting it.
Maybe the fact he lives in Kent is a valid excuse and he was quietly confident being an experienced property developer as well as a marketing professional. He still got a telling off from Martin though.
Neil had six weeks and a £6-7k budget to do the work and was confident of a fairly easy upgrade.
Famous last words. Fourteen weeks later the show returned and Neil was lamenting the Welsh weather, located on the side of a Welsh mountain trying to upgrade the garden between a barrage of bad storms.
He says: "The major challenge that we faced over the last few weeks is the appalling weather that we've had. It started with Storm Eric, moved on to Storm Freya, then we had Storm Gareth and finally storm Hannah!
"One after another which really put back a lot of the outside work, which then held up the inside work."
It didn't help that all the tools, machinery and everything required had to be squeezed around all the corners of the odd layout of this maze-like property - see, internal flow is important after all.
Another problem was an apparent fallout with the local contracts, so Neil ended up doing far more of the work than he intended, with the help of his brother.
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All leaks are gone, one chimney has gone, and the guttering and fascias have been replaced, with the budget spend of about £7,000 this means Neil could make a £36,000 - £41,000 pre-tax and fees profit as the estate agents value the house now at between £85,000 and £90,000.
But it's the rental market Neil is more interested in, and the house with the 'hotch potch' floorplan could make him a very respectable 12% yield on a rent of £500 per calendar month.
But maybe the best part about this house, once you navigate the walls and doors, is the garden - now tidied up and a seat built at the bottom, the panoramic views of the mountains of the Welsh valleys are priceless.
This story appeared in series 23, episode 5 and is currently available to view on BBC iPlayer.
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