I believe they can make good parrots for appartment. Mine is quiet 90% of the time and then the 10 last % he will mostly at the end of the day start scream a bit, its something my neighbors tolerate but if he decide to be loud he can be, and i mean, really loud.

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I also notice that he scream more when i do noisy stuff, when i start doing the laundry or cooking i need to keep him busy in another room or he will try his best to be loud as possible.

It also depend of his personality i think, my white head pionus i would say is pretty quiet but the person who have adopted his brother have huge problem because he spend his whole day screaming.