Keeping birds of different species who can provide company if not companionship for one another is a good idea. Birds can also get along with other animals, and if approached creatively, keeping a single pet bird can be quite gratifying for the owner, and a happy situation for the bird. My apartment is a mess. Birds are messy. They don't really care where they go to the bathroom.
Birds also tend to scatter their food, and feathers seem to be around all the time.
The flapping of wings can make seed and feathers travel some distance from the cage or play area as well. Although there are measures you can take to minimize the mess, you cannot hope to eliminate it. He chews on everything. Birds, especially parrots, love and need to chew. Toys are designed to provide an outlet for this very natural behavior, but unless you limit your bird's mobility and access, he will make toys of your books, picture frames and furniture.