We stayed here for 2 nights for the recent Police concert.
From the outside, the hotel doesn't look great but it does get better inside. Arrived early at 11am and our room was ready as we had requested an early check in. Had requested a double room with high floor close to the lift and that's what we got. However, the double room close to the lift is very small - so perhaps request a room with 2 double beds even if there is only 2 of you as the twin rooms are much bigger (once it doesnt cost more of course !). Room was clean and well presented. We did request a city view which was a mistake as there is a building site across the road so no sleep in that's for sure ! Request a room at the back or a bay view . Had breakfast in the restaurant on both mornings and while busy, no problems at all. Good selection of food and all well presented. The bar is nice too, split level with 2 flat screen tv's and there is also a large heated decking area for smokers out the front.
Overall would recommend but dont judge it by the outside and watch out for size and location of the rooms !

As you'd expect with a Marriott, the hotel facilities and staff were well above average. The hotel is located right next a shopping district with tons of great food and bars. It's also located about 1km south of Cardiff's huge city-center park with tons of trails and other activities.

We stayed at this hotel for one night with our two children when the Wales V Germany football match was on. We have stayed here before as it is ideally situated near the Millenium Stadium and Railway Station. On arrival our room was not ready, as we wanted to go out for the afternoon we were not really bothered. When we returned later our room was still not ready, the Reception staff kindly upgraded us to a fantastic suite. The Staff are very helpful and polite. Although the hotel was busy due to the football match, it was very quiet in the restaurant at breakfast. The breakfast was delicious with plenty of variety. The only bad thing about this hotel is the price of the drinks which are very expensive! We will definately stay at the Marriott on our next visit to Cardiff.

Just stayed in the Marriott for a wedding in Cardiff and found it ideal for our needs.

The hotel is centrally located, over the looks the Millenium Stadium and within walking distance from the shopping centre with the new Mermiads Quay also easily accessable.

The hotel is clean modern and as functional as you would expect from a city centre hotel.

We had a nice room with 2 small double beds which was very clean and modern.

There was an ideal typical buffet style breakfast which was most acceptable.

My only gripe is having to apy £10 per night extra for parking which I feel should be included.
Otherwise highly recommended