I think I saw you have a few months to move out of your foreclosed home, so I would take that opportunity to get started on training Valentino. Working with a parrot is like working with a toddler- you must be consistent and make it VERY clear what you expect of them (and what will happen if expectations are not met). When Kiwi came to us he was basically feral. Thankfully we were in a detached unit when we first got him (he has an atrocious screech), and we got the screaming curbed within a few months. He got lots of praise for any positive noises. When he screamed loud, we would ignore it for about a minute, and if he was just THAT worked up, he got a time out. I would warn him "time out", and if he CONTINUED to do it, he got it. As in 3 minutes in a quiet, covered cage so he could calm down and compose himself. Once he quieted down, we praised and gave treats. We used a different color blanket for time outs so he didn't associate the time outs with bed time. He learned fast. He still lets loose every so often and still gets himself an occasional time out, but for the most part, he is pretty quiet. He uses lots of nice little noises to communicate and express himself.
When he started coming out and exploring more, he got a (very light) tap on the beak and a firm "no" when he touched something he wasn't allowed to (furniture, panelling, cords ect...). We gave him lots of praise when he played with something in his cage or on his play gym. He learned very fast not to touch stuff outside his areas. When he isn't in his cage/on his perch, he is closely supervised so if he does get a bit curious we just have to tell him "no" and he will stop what he's doing even if we are across the room. We also try to always make sure he has little toys to play with when he is away from his areas so he will leave stuff he can't touch alone, and use the key word "yours" as we hand an item to him so he knows he's allowed to touch and play with the item.
Potty training was a matter of watching him, closely. When his butt would start dropping, we would grab him and quickly get him to his perch. We actually didn't intend to potty train him, we didn't even know parrots could be potty trained! He just learned in a hurry to stick his foot up for a ride (he doesn't fly) BEFORE he had to poop or he would be getting rushed back when he really had to go.
Mess is the one thing you just cannot train out of them. They are messy no matter what. With Kiwi, we keep him on a very large, inexpensive rug that doesn't matter if it gets damaged or not. I use the rug because it's more "decorative", however, you can just go to any carpet/flooring store and buy a big scrap of linoleum flooring for next to nothing that will do the same job. Kiwi is not a big flinger, but we did have to keep his cage close to a wall in our last place, so we kept a plastic sheet up behind his cage to protect it. You could use a tarp, or just go to the fabric store and buy a heavy-weight vinyl sheet by the yard. I diligently clean Kiwi's cage, play stand, t-perch and rugs every day so that never would there be a time the landlord comes over for an emergency or whatever and sees a dirty area with seeds and poop everywhere. As I said, it can be done, but it is a lot more difficult to modify their natural behaviors and keep a eagle eye on them than it would be in a place you own (and make the rules for). Very constant reactions to behaviors, reinforcement and diligent supervision is KEY to owning large parrots in apartments. And at the end of the day, it also YOUR responsibility to watch them to make sure they don't rip up the walls and carpet, or scream until the neighbors call the cops. Even if we owned out home, Kiwi would not be allowed to be destructive or excessively loud. Plenty of parrot owners work through all these issues and live long and happy lives with their birds in any living situation they find themselves in. If Valentino is a smart boy, I'm sure he can learn too. Best of luck!
