We had a two night stay to visit the mediaeval town and found the location of the Cerise Carcassonne Sud excellent for this purpose. The carpark is very large and secure with gates closing from 9 pm. The old town is a 5 minute walk away - very do-able even in the 35 C heat.
Our rooms (in block A) were very large, disabled friendly, if a little utilitarian with sparse oldish, basic furniture (no bedside tables). Air conditioning worked well, the king size bed was very comfortable and the shower was stable and controllable. Our bathroom was a fully accessible wet room and very large. Perfect for older travellers. The wifi was a bit patchy, but we understand that this was a temporary issue.
The breakfast (extra cost) was reasonable - better as a Continental rather than the cooked variety. Dining in room would be possible with basic facilities (microwave, fridge, hotplate) with cutlery, crockery and a few pans provided. The hotel is on the edge of town with a pattiserie and grocery stall about 15 minutes walk along a busy road.
Overall, the Cerise Carcassonne Sud was well located and comfortable. Not an expensive, luxury hotel, but probably great for families and perfect for visiting the old city.