Hi there! We are looking for a place to stay for just a week

Hi there! My name is Paulo, I am 22 years old, and I am from Bolivia. Currently I study at the uni in Moscow, and I want to visit Cologne once again with my girlfriend, her name is Irene and she is from Stuttgart. We are a nice couple! We love speaking languages and to travel and learn about cultures. Two years ago I lived in Cologne for more than 13 months and I studied german, therefore I speak german (forgot a lot of it). I also speak Spanish, English and Russian. And about Irene, she is half Spanish/German and she is 20 years old. she just arrived from Bolivia, she went there to do a volunteering At an orphanage :) So we will be visiting Cologne for just a week with, and we would love to stay somewhere friendly :) If you could host us would be awesome! You can find me in Facebook: Paulo Cesar Vaca.
Or text me on WhatsApp: ----/-------

Thank you!