Ok, the problem with that (for me) is that you have to walk through the living room in a diagonal direction (around furniture) in order to get to the dining room/kitchen area. At least with the current layout there is a 'corridor' of clear space that you walk through. Some people don't even like doing that and will build a stud wall to separate the living room and create an entrance hall. A downstairs loo is always a plus though, so what might be possible is to put in a new staircase with some winders at the bottom, so where the current door to the staircase is, that becomes the first riser/tread of the new stair. This should mean that the current understairs cupboard gets deep enough to house a WC and still keep the existing door between living and dining. I think it's also worth looking at the possibility of adding an ensuite shower/wet room to the front bedroom by pinching a bit of space from both bedrooms, thus ending up with two ensuite bedrooms. It means losing the existing bedroom built-in cupboards, but they look a bit measly anyway. I would also check whether in the future a loft extension was possible, if so plan what you do now so that it will incorporate the loft, the main issue being where would the staircase up to the loft go? The main bathroom directly off the rear bedroom is a common problem with these 'two up, two down' houses, ultimately it comes down to the occupier and how they see themselves living there. There usually has to be a compromise of sorts. The current owner obviously didn't mind the compromise of walking through a bedroom to get to the bathroom. If you rotate the staircase you end up with a much smaller second bedroom, in the example shown they ended up with a single bedroom. It was a compromise they were prepared to accept. Estate agents plans aren't that accurate, the OP would be wise to go back with a tape measure, mark out the corridor (say 800mm clear) and dividing wall (100mm), and see what space would be left for the second bedroom. The OP needs to decide what is most important to them, but also remember that one day they will have to sell, so best not to come up with a too idiosyncratic solution...