‘Imaciated dog’ and ‘owner neglect’ of their own home… very strong words for a Friday morning.
Internal cameras are totally out of order with THS inside the home, if the internal are turned on, just unplug them, but also message the owners about how they aren’t allowed and/or chat to THS.
However, if you are in the UK, are you sure they are cameras and not just simply old sensors, as that comes up A LOT on the forum, sensors are totally fine (just google alarm sensor for images), they only activate if the alarm gets set, and a lot in the UK are old and from decades ago and non-functional anymore, so those are not a reason for concern.
Food - you’ve missed out one ESSENTIAL detail, is the quantity of food they are fed the correct amount for their size/weight. A lot of dogs are always hungry, they’ll vacuum anything up, and some dogs (not many nowadays) are fed just once per day for certain reasons, given one of the dogs appears ‘imaciated’ it may be that they got that dog from an animal rescue place and the dog was used to being fed just once per day, so they may have kept it’s feeding habits the same, but there are loads of reasons non-rescue associated too. It’s the quantity of food that I’d be checking, that will either give you cause for concern or not.
House - owner neglect??? It’s their home, not a holiday let, maintenance things like you mentioned do happen occasionally.
Bathroom vent - Has water been coming in non-stop from it when it rains if so, let the owners know. Or might it have just have been down to the exact way the wind was blowing on that occasion. Our front door has that problem, once every three years the wind will blow in a direction that is not normal, and water comes under it.
Coffee machine - things break, coffee machines have a life span, it happens. It wouldn’t be a concern for us.
Door handle - The owners may have already known it wasn’t in great condition, but because it’s their home they’ve probably just kept on repairing it when it ‘goes’. It’s just something for the owners need to fix when they return, unless you fancy fixing it yourselves. It wouldn’t be a concern for us unless it was a main door into the property.
So without knowing if the quantity of food is correct for the dogs, from what you’ve said (unless there’s more things) the only thing we’d really be concerned about is the cameras, if they are actually cameras and not just sensors.