Thank you, @docdenny . I am pleased to share with you this information. I hope this can help you even if I haven't done so much to reduce the noise.
So, I recorded in a very small room (2,5m x 6m with high walls), using the AKG Perception 220 microphone connected to the Focusrite Scarlett 2i2. As recording software I used Audacity. Again, with the same instrumentation, but in a much larger room and using Cubase as recording software, I got another result, with much background noise: https://www.youtube.com/watch?v=Akmf4wr4Ubo .
I can't wait to listen to your music. Feel free to ask me other information! Cheers, Irene