Hello, welcome here ;-)

Alexandros , from the recording it seems that you are getting a better tone than I expected.  I had one come in my shop recently for some improvements. It was hard to play and had a very small choked voice.  If you can afford to take it to a guitar repair person there are some very simple modifications you can have done that will make a lot of difference. The first and foremost is to take out 60% of the bracing. I describe it on my website if you are interested: http://www.blackbirdstringarts.com/ . If you are good with wood tools you could do it yourself.