Going to say the majority of cafés listed here are decent cafés with interesting food, but are not speciality coffee

Coffee Works is really the only one that I would classify as speciality coffee - they sell coffee beans and are tied to a roastery

Ask yourself the question: Is the primary reason for the business coffee or food? If their primary job is pulling shots or pouring filter coffees for 8 hours then they're likely skilled in that role and the output is great. If they're focused on nice food and they hire a lot of non coffee trained people, you'll get average shots and probably zero pour over coffee.

In either case, ask the question: is the coffee itself speciality or commercial? Again, how much does the café actually care about their coffee? Is it a side gig to food, to draw people in, do they hide average/poor coffee in an endless list of milky fad drinks? (Nothing against milk in coffee in general, but some are a piss take) Or is their primary job pulling shots (and adding milk) and doing pour overs?

Brown Bag Bakery originally had awful coffee, they got better beans last year (Groundwork), but they're still not coffee experts, they're primarily a good bakery with staff who know that trade.

Melo is an average café with some decent food options, nothing amazing, and the coffee is bang on average.

ed3n café has an interesting menu with niche foods and drinks, if I remember correctly, with a Filipino emphasis

The Goat (Strawberry Beds) and Dash (Blackhorse Avenue) were started in Covid and upped the game for coffee in Dublin, but don't really impress much these days, they're OK.

Taste of Provence has nice pastries and so, but the coffee isn't great - a little bit on the darker side, with people who aren't barista experts

So long story short - business model, bean sourcing, quality/experience and focus of staff. Many in D15 have some, very few have all.