I would have to say, it is not, a no no. However, how you decide to do this will determine whether it is positive or negative. If the toilet is in direct view as you enter it is likely to be negative, but the impact can be reduced with a smaller pan and an in-wall cistern. Noise and smell are often factors that will influence the decision. So, the smell can be overcome with an automated odor extraction system and there are also low noise inlet valves available. As far as property value is concerned there is a multitude of scenarios and just as many opinions, so consider how much convenience this will give you and how long you intend to stay in the property? perhaps it may be better enjoy your home the way you would like it to be.

I love those long floorboards/wood-look tiles and they are the feature so you wouldn't want something too busy on the walls... personally I would go with a larger format say 300x600 rectified edge white tile with a matt finish for the Hamptons look... what's your vanity?... a timber one would tie in nicely with the floors and all the white... very Hamptons :)

Depends on height of the ceiling,and size of your room. ceilings up to 2700 tile to ceiling ( replace ceiling, it is not a good look new bathroom with old ceiling, unless featured ceiling, you need to remove cornice, Tile all walls to ceiling, add new cornice for professional look ) Have you thought of feature wall behind basins, same as floor tiles ?

also will give illusion of a bigger bathroom if you use bigger tiles ..I used small ones on one wall as feature wall and larger ones on other walls ..