Are there any specific questions that you have about your chosen course, accommodation, the university or the city itself? I will do my best to answer.
Overall, I've enjoyed my time at Cardiff University and would recommend it. The university is located just minutes from the city centre and I think there is a good balance between uni life and city life. Cardiff is also a relatively affordable city, which is great for making your money go further, and there are great transport links between Cardiff and other destinations. The students' union is great for nights out, and attending events, and accommodation or part-time jobs help and there are a variety of nice libraries to study in across the city.
I hope this helps - please let me know if I can help with more specific questions.
All the best,
Jaz - Cardiff student rep