Welsh-placename-euphony: a thing which I find inspirational in this game -- and have thus in the past, quite often quoted from -- is the book (compiled in the 1940s) which we had in my childhood home, of various silly-but-diverting humour; including a large section of "clerihews" on the names of assorted settlements in Britain. There was one therein, about the abovementioned Cardiff district:
Splott / Sounds Teutonic, does it not? / But instead of being in, say, Bavaria / It's a South Wales built-up area.
I remember no other such rhyme from this collection, about anywhere else in Wales; but there is a rhyme, source unknown anyway to me, about a settlement further north in Wales: Dolgellau, Gwynedd. The rhyme -- thought up long ago-- uses the former standard English spelling of the name, viz. Dolgelly (fun to be had involving English-versus-Welsh spelling / pronunciation, whichever rendering used). The sub-optimal hostelry mentioned, is "asterisked" in the rhyme's printed version: will use here, a name picked at random -- the "Anchor".
If ever you go to Dolgelly / Don't stay at the Anchor Hotel; / There's nothing to put in your belly / And no-one to answer the bell.