I think that with 3br it is possible that it will be tenanted by 4 people and with 4 people in the house a second loo is a blessing.
I don't mind shower/baths and they come in all sorts of shapes and sizes. If money isn't a thing you could even look at a small corner shower/bath/spa. We used to have one and it was awesome. Not just as a spa for me but for whipping the boy's bath up into a tower of bubbles.