Quantum Coffee Roasters - Cardiff

Coffee, Coffee, Contemporary
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Quantum Coffee Roasters

Quantum Coffee Roasters
4.7 / 5 (1311 reviews)

Menu

A complete menu of Quantum Coffee Roasters from Cardiff featuring all 32 dishes and drinks can be found here on the menu.

Independent family-owned coffee roasters and coffee house located in the vibrant Cardiff Bay. Our dedication to coffee blends artistry and precision, exploring the endless potential of this beloved beverage. While coffee is our specialty, we offer more than just a caffeine fix.

Last update: 17.01.2026 from: Dave

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★ 4.7 / 5 from 1311 reviews

Nestled in the heart of Cardiff, Quantum Coffee Roasters offers an inviting atmosphere, rich aromas, and an impressive selection of coffee. While many patrons rave about the high-quality brews and friendly staff, the experience can be inconsistent. Some customers express disappointment over service issues and uncomfortable seating, while others appreciate the warm welcome and the establishment's cleanliness. Despite mixed reviews, the café remains a popular destination for coffee enthusiasts, drawing repeat visitors who enjoy its cozy setting and passion for quality beverages. For those looking to unwind, Quantum Coffee Roasters is worth a visit to savor an excellent cup of coffee.

sh4ki8
01.02.2024

As per the title, we needed a pitstop to get the babies milk warmed, nappy changed as we had been out for some time. We ordered a chai latte too. The staff were very warm and friendly. The bathroom was really clean so we had no issues changing the bubba in there. Would definitely come again. Thank you.

sumbr
01.02.2024

Lovely staff and great atmosphere. Spent a morning here working remotely and found it very welcoming. Coffee and hot choc both very good! I’d note that it does get very busy around lunch time, so maybe avoid at around midday!

daydream00858920055
01.02.2024

I visited the café during the school holiday's with my two well behaved children and didn't have a very good experience. While choosing cake one of my children pointed at the glass counter touching the glass while choosing the cake and was told off very rudely and patronising by one member if staff miserable one with ginger hair) she clearly doesn't have children. I can fully understand if they touched the cakes or were constantly rubbing dirty hands on the counter, but that's definitely not what happened. She really need's to get manners.

dave-woodcock-dog40
06.09.2025

Food: 5 Service: 5 Atmosphere: 5 Service: Dine in

katherine-restaurant-2
06.09.2025

Went in today in the afternoon, food and the place itself was quite lovely, although these two young girls serving really ruined it for me. no smiles, i felt spoken down to, they had no manners and it made me feel like asking to be served was an inconveniance. Food: 3 Service: 1 Atmosphere: 3

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