It looks like there is another house next to it in what was next door's garden, but built diagonally on the plot so it looks across the Omaze house plot? As is often the case, the devil is in the details not shown in the Omaze website photos and description.
I agree though, I certainly wouldn't say no to winning any of the Omaze houses or cars, even if I just sold them immediately or fairly soon after. The cars I would definitely sell immediately as we don't need or want a new, flashy or expensive car, but the money instead would be put to very good use. Any London house I would also definitely sell immediately, perhaps just having a family holiday for a week or two in it to experience that and see the sights, and letting a small number of close friends do the same, while it sold. The other houses, like the current Yorkshire and Devon houses, I would probably like to try them on for size for a while and see if they fit before deciding to keep or sell. I wouldn't keep them to let out as I wouldn't want the responsibility and possible problems that come with that.