My husband, extended family and I enjoyed our stay at the West Inn and Suites. Although the hotel is located right off the freeway and near railroad tracks, we found the rooms surprisingly quiet. The rooms themselves have a modern elegance and we found our stay very pleasurable. The beds are extremely comfortable!!!
We were expecting more from breakfast given how nice the rest of the hotel is--really, the food was little better than what you'd find at a Holiday Inn Express. However, overall, the rooms more than make up for it and we would highly recommend the West Inn and Suites.
(Note that this would NOT be an ideal choice if you are looking for something close to the water as even though you are within walking distance of the beach it is in more of an industrial area compared to hotels in downtown Carlsbad. However, it's an easy five minute drive to beach access.)