My husband and I stayed at the Radisson Blu for 3 nights during our stay in Split. We used it as a jumping off point to visit Hvar and other surrounding towns, islands.
It was very clean, very massive, and rooms were nice. If you are looking for quaint and boutique...this is not the place for you.
Be sure to ask for a room in the newer/main part of the hotel - the wing facing the ocean is super dated and dank.
The breakfast buffet was massive, something for everyone.
If you plan to go to Old Town, take a cab - cost is10Euros each way but its worth it and takes half the time as the bus route. The bus line takes 30mins to get to Old Town and its just a dirty experience.
The location of the hotel is nice just outside of Old Town. The beach area is great way to spend a sunny afternoon - just be prepared for the walk back up the stairs to the hotel. And there is a great trail you can use for a jog along the water or to walk to Old Town (about 40mins).