Give the puppy a million chew toys. Encourage him to use them. If he goes for something that's not a chew toy, say "leave it!" in a firm voice, take it away from him and immediately replace it with a chew toy. Praise him for chewing the toy instead of the inappropriate object. Your puppy will eventually learn two things: 1. "Leave it" means exactly that, and 2. Chew toys are way more fun than your shoes.

As for toilet training, every time he has a meal, take him outside. When he does his business, give him insane levels of praise. He'll get the message. Somebody else here mentioned that puppies have small bladders. This is true and you can expect to have to do the toilet/praise thing many times a day. Your puppy will eventually come to realise that you are the person who opens the door to let him out, and he will come to you when he needs to go to the toilet.

The most important thing for puppies is to give them consistent discipline. I don't mean discipline in the punishment sense, I mean it in the "setting rules and boundaries" sense. Dogs like boundaries, but they need to know what they are. That means you must demonstrate and/or guide them to good behaviour. Reward good behaviour with heaps of praise. I'm not a fan of punishing dogs for bad behaviour. It's far less effective than positive reinforcement. Never create a situation in which your dog genuinely fears you. You must create an environment in which your dog wants to please you. Rewards and praise are the best way of doing that.

I know your puppy's stay with you is only short-term, but I think that you and the pup will both get a great deal of joy from your interactions together. And please post a pic

Max