Barranquilla Hotels, Barranquilla Apartments
These are the hotels I've stayed at while in Barranquilla. If you want to make a reservation for Carnaval then I highly recommend booking a hotel at least 6 months in advance. The Dann Carlton is the nicest and fills up the quickest.
The Hotel Dann Carlton is the nicest hotel in Barranquilla and has a revolving restaurant at the top, which gives a great view of the city. It's also right across the street from the Buena Vista mall. The pool is really nice too, and the service is excellent.
The Hotel Windsor is another nice hotel. I prefer to stay here when the Dann Carlton is completely full.
The Hotel Barranquilla Plaza is pretty decent. It also has a nice pool. Even if you don't stay here, you can still hang out by the pool.
The Hotel El Prado is an older hotel, but it's the most famous hotel in Barranquilla. This hotel has a lot of history, and the decor is really nice. The rooms are a little old fashioned, but the pool is really nice. Even if you don't stay here, you can still pay around $15 to go hang out by the pool all day, eat food, etc.
There are plenty of Barranquilla apartments to choose from. For short-term rentals, I recommend going online and doing a Google search for the term "Barranquilla vacation rentals", or "Apartamentos en Arriendo Barranquilla" (for long-term rentals). By the way, if you don't speak Spanish then I recommend asking a friend or someone you know to help out with the reservation. Major hotels generally have someone on staff who speaks English, so it's usually not a problem.
I've also stayed at Apartamentos Alvaro Jesus, which are somewhat like apartments with hotel amenities. There are several room options to choose from. Each room has a small kitchen with a refrigerator, stove, etc. Each room also has a small living room that's separate from the bedroom.