The perils of browsing adverts, hearts can rule heads. Especially when confronted with cute doodle pics.
Have you had dogs within the family? Have you had any experience training dogs?
At 6 months this pup is venturing into the teenage dog phase, a common phase for dogs to be given up as they start to forget all that training they picked up and go nuts instead. Doodles are not immune to this, and Labradoodles in particular tend to be verybigdogs, a lot of dog to be chewing on the furniture.
If you do go and look at this dog, as @maxelly advises, if you have kids DO NOT TAKE THEM. Hearts will rule heads. You need a solid head on your shoulders.
If they bred this pup, then they should have full health test results for the parents. Labradoodles are not immune to things like hip dysplasia, if someone was breeding Doodles you would expect them to perform all the relevant health tests (not checks, tests) for both the Labrador and the Poodle parts of the crossbreed. No tests = no dog, walk away.
Remember, if an experienced owner/breeder can't cope with managing this six month old pup, what would you as novices be able to cope with?? It's not fair on this pup if it doesn't work out with you for the dog to be passed on yet again - the more homes they have, the more confused and messed up they can become, especially so young. If you decided you couldn't cope with the pup, would this owner take the dog back? (Or just change their phone number and block you = this is more common sadly.)
Do not rush into dog ownership, always look a gift horse in the mouth. Making a mistake and taking on too much dog will not only destroy your family's confidence in dogs, but will break your hearts and probably several family heirlooms in the house as well.