Issues, the tenant, and the instructions Alfred follows for this property.

Open a property and choose Maintenance. It is everything happening between you, the tenant and the trades on this one property. The picture above shows it.
Below sits Your contractors — the trades saved against this property, offered first when an issue matches their trade.
The green banner is the switch.
With Alfred on, an invited tenant can message him about a problem and he handles it — gathering detail, finding a contractor, arranging access — within the limits you set in Settings → Alfred.
With him off, nothing is arranged without you.
Click New issue, describe the problem, and choose whether to loop the tenant in or keep it private. An issue is how anything in flight is tracked, whether or not a tenant reported it.