Hello!
I'm in my first here in Cardiff (Business & Japanese) and as I'm writing this I'm procrastinating so that I don't have to study for my statistics exam tomorrow lmfao.
Congrats on your offer, first of all!
As far as I know, the School of Chemistry is located inside the Main Building, so applying for University Halls would be horrible because: a) very, VERY far away from the city centre, you would have to take the bus daily from Uni Halls to the Main Building (luckily there's a free bus service run by the uni every 30 mins, but still...). And it would be a huge hassle to come back home from a night out because you would either have to walk for about 45 minutes or take a taxi; b) very noisy, as a Chemistry student there will be a lot of studying and you don't want people banging in your head, believe me.
Taly North is ok, it has the sweet advantage of an en-suite bathroom (Uni Halls is en-suite as well) but the rooms are so small you can barely move. There's the more expensive version of Taly North, Taly Court which is really nice. You can go on Cardiff Uni's website and look at the pictures or come here on Open Day!
Also, the division between Taly North and Taly South is real, lmao, just imagine Korea on a smaller scale.
Right now I'm living in Senghennydd Court, which is called Senghetto or just the Ghetto, mainly because of the 3-story blocks with no living room, shared bathroom and tiny bedrooms - not as tiny as Taly North en-suite, though! (and I was lucky to get the largest room possible in the flat haha, lucky number Room 1). It kind of looks like a Ghetto from the outside, hence the name.
The advantage of living in the Ghetto is the fact that it's sooooo close to everything. Literally, it takes me less than 7 minutes of walking to get to the city centre, and that's a blessing when you're wearing high heels and you just want to lie down faster after a big night out hahaha
Also, very close to the Uni, I walk about 10 minutes compared to the poor souls in Uni Halls who have to take the bus...
The disadvantages of Senghennydd would have to be the shared bathroom, the constant noise (parties EVERY F-CKING NIGHT and also the train that runs close to the houses but you can't really hear it so it's ok) and 1 small fridge for 5 people (this is ridiculous). Buuuut, it's the cheapest accommodation you can get and tbh I feel so blessed for being close to everything that I stopped caring about the fridge and the noise, you get used to it.
PS: One Punch Man is awesome :'