I mean I guess I could live with the bathroom being down the stairs if it was a short flight (saying this like buying this house is an option for me 😂)
It seems to have a disproportionate amount of sitting rooms even allowing for a couple being bedrooms.
If money was no object I’d convert the basement into a kitchen/dining/sitting area, with a cloakroom off it. Rip out the ground floor panelling and fireplace and make it into a smart living room, maybe with a walk in storage for coats and shoes. Convert the first floor into a big double with en suite , leave the second floor as is with the little bathroom for their use.
then 100% reconfigure the top floor to have a nice big en-suite and maybe a walk in wardrobe