It looks nice on the outside, the layout looks ok, but the bedrooms are tiny.
Do you need all 4 bedrooms as bedrooms? I can't see how you could make bedroom 1 a useable double room for anything other than a guest room for short stays, unless you rip out the ensuite and turn it into a walk in wardrobe or use bedroom 4 as a wardrobe / dressing room (possibly knock a door through into it?)
A regular double bed is 4'6" wide, by 6'3" long. I would say ideally you want (at least) 2' of space each side to walk around comfortably, so you need 8'6" x 8'3" of space just for a double bed. A wardrobe is a little under 2' deep, so that needs to be added on too. In my opinion anything less than 10' x 10' isn't really enough space to put in a regular double bed and a wardrobe, and that assumes there is only 1 door and 1 window to position furniture around. The more openings you have in a room, the larger the room needs to be (again, in my opinion) to fit a bed and wardrobe in.
Does it have to be a 4 bed new build? If not, look at an older property (eg 60's / 70's build) or a 3 bed newer one as you may get better sized bedrooms for your money.
Sorry I can't be more positive. I'm not a fan of new builds generally due to their small room sizes, but everyone's priorities are different hence why there is a market for them.