Translation of sanieren

I hope you could understand my last letter to you. You see, when I write in Spanish I am not very confident. I always question myself and each and every sentence takes about fifteen minutes.
Wars and struggles are always or mostly based on ignorance, fears and disrespect of the enemies. Unfortunately, the kind of hate which roots in previous wars never stops. Let me be clearer, please.
The room had around 4 square meters and the bathroom and shower were tiny. I was not content about that, as we could have stayed in a much better hotel for less. But we had made reservations in advance anyway.