Training your Rottweiler to be well-behaved in a house or apartment setting requires patience, consistency, and a positive reinforcement approach. Here are some steps you can follow to help your Rottweiler develop good manners:

1. Establish yourself as the leader: Rottweilers are naturally dominant dogs and need a strong pack leader to help them understand their place in the household. Establishing yourself as the leader will help prevent behavior problems such as aggression and disobedience.
2. Potty training: Start potty training your Rottweiler as soon as you bring them home. Take them outside frequently to go potty, and always reward them with treats and praise when they do their business outside.
3. Basic obedience training: Teach your Rottweiler basic commands such as sit, stay, come, and heel. Use treats and positive reinforcement to encourage good behavior and discourage bad behavior.
4. Socialization: Socialization is crucial for Rottweilers. Introduce your dog to new people, places, and experiences to help them become confident and well-behaved in different settings.
5. Exercise: Rottweilers are an active breed and need plenty of exercise to maintain good health and prevent destructive behavior. Take your Rottweiler for daily walks, play fetch with them, and engage in other physical activities to help them burn off energy.
6. Consistent training: Consistent training is key to helping your Rottweiler develop good manners. Set aside time each day to train and reinforce good behavior.
7. Avoid punishment: Avoid using punishment as a means of training your Rottweiler. This can cause fear and aggression and damage your relationship with your dog. Instead, focus on using positive reinforcement to encourage good behavior.
8. Address behavior problems early: If you notice any problematic behavior, address it early before it becomes a habit. Seek the help of a professional dog trainer if necessary.

In conclusion, training your Rottweiler to be well-behaved in a house or apartment setting requires patience, consistency, and a positive reinforcement approach. By using these tips and working with your Rottweiler consistently, you can help your dog develop good manners and become a well-behaved member of your household.