I have done 13 post covid. All P&O. All very enjoyable bar one (Iona). As a solo traveller (select balcony) I can't beat their price . Also prefer small, adults only, so they have ships that fit the bill.
I do most of my cruises on Arcadia and Aurora and find my balcony cabins on them more spacious (and with much more storage, including drawers!) than on Iona (which I won't be trying again). Had problems with rowdy kids (and some adults!) when I was on her too.
Good reviews from some of you on Elizabeth House. So am using for my Arcadia 24 nighter in September. £268 including parking. Not bad and cheaper than my usual, Holiday Inn. Hope it is ok.