Too many colors, pieces of furniture etc. Also, put covers on the burners, locks on doors with poisons, etc. Also, locks on your entry doors are important because wandering is common. It is much like caring for a very young child. Same for liquids.
Room temperature is ideal.
Any extra stimulation will cause problems with attention. Families should remember that this is a process that could last a long time. Pacing is the key. Don't get overwhelmed. All rights reserved.