I asked Google's Bard AI about this and was informed that it was a very popular cocktail lounge. It is a vintage clothes shop and to the best of my knowledge it operates from the basement. I often wonder if it was inspired by "Lucy In The Sky With Diamonds".

It is located at 11 Fownes St Upper, Temple Bar, Dublin 2, D02 XW64, Ireland. If your are a weekend shopper It is open on Saturdays from 12pm to 6pm and on Sundays from 2pm to 6pm.

Here are some reviews of Lucy's Lounge:

"A little gem in the heart of Temple Bar. Once you see the bright pink and purple building on Fownes St, follow the stairs down to the basement where you'll find a pic n mix of clothes, shoes, bric a brac and accessories!"
"A curated street style fashion. Source for film industry."
"I have found some lovely pieces that I have for sale, here or in my shop Temple Bar Dublin, Ireland, Basement 11 fownes street."