You can try a cage training. Just put your puppy in there while you are gone and for the night. As soon as you come home or wake took the dog out( do not let him play around untill you take him outside) Usually works pretty good and you can stop using the cage after that if you dont want to.
Also, you can just watch the puppy carefully and as soon as he starts to look for the place for toilet take him out. In any case, it takes more than a week to train the dog.