I wouldn't leave a dog with a free run of anything til at least 12 months and absolutely reliable (as this is the number one way to un-housetrain your dog and end up spending weeks on remedial housetraining -- people always assume their dog is housetrained well before it actually is), PLUS through the chewing stage. Coco isn't old enough to be starting serious chewing, which generally runs from about 7-8 months through to 12-18 months but can last a lifetime for some heavy chewers. Chewing means they can chew through a wire -- and die -- which happened to someone's cavalier pup on one of the boards a while back. They can also demolish anything within reach -- common targets being furniture, books, glasses, shoes, skirting boards, stripping wallpaper etc.
It is also a very good idea to wait til your dog is an adult whose behaviours you know very well (these change too constantly in young dogs). Many dogs simply cannot be left loose or they get anxious and/or destructive or into danger (think in terms of totally having to houseproof -- many dogs learn to open cupboards and can get into poisonous items, eat an entire bag of food and need emergency treatment, get into dangers like chocolate... a lot of thought needs to go into making ALL areas safe from bathrooms to kitchen. Many dogs will climb onto tables when people leave and knock over breakables. It is best to wait til an owner can accurately assess an adult dog on whether they are even a good candidate for being left alone, unsupervised, in an entire house.
Many trainers feel dogs generally should not have the run of the house any more than toddlers should, for the same reasons. A dog with the run of the house is always exposed to considerably more risks, many of them ones an owner won't realise or think about, than a dog confined to a pen or a room. The unexpected can always happen. BTW many trainers consider it dangerous to leave a dog with toys or chews that could be ingested. Safe chew toys like Kongs are OK. I wouldn't leave a dog at home with rawhides, or other chews that generally are better given only under supervision.
Two of my dogs are always penned into the kitchen, for various reasons. The others until very recently always stayed in one room together. Due to my partner's GSD needing to be in one room when we go out, and it not being a good idea to leave large and small dogs alone together, I now leave the trustworthy three with access to most of the (small) house. It took some training for them not to bark etc but over time they are used to being on their own and settle quickly. None are chewers and all are reliable ad always have been; all are at least age 5 and mature calm dogs. If I had a spare bedroom I'd consider it better though to have that be a designated comfy dog room and confine them to a single room (also safer in an emergency if all dogs needed to be found and got out of the house quickly).