Hi people

3 weeks ago I adopted two kittens who were found on the streets next to their dead mother. They are brother and sister. They are about 12 weeks old at the moment and have opened up greatly. They constantly play together and socialise with me, which is great.

However the past few weeks they have been destroying half of my apartment, ripping my new couch, curtains, chairs, clothes, destroying my plants, digging in them etc. They are also very aggressive towards each other and sprinting all over the place all the time (which is a healthy thing).

How can I contain the damage they do or teach them to stop destroying everything in their path?

EXTRA INFO
I live in an apartment, it's about 110 square meters and has two floors, so not a small one. They have climbing and scratching poles which they use, about 6 toys, have separate rooms where they can retreat, two litter boxen, two bowls of food, two bowls of water etc.

They have NOT been sterilised or castrated yet, but they will be in a couple of weeks since it's legally required here.

Any help?