I spent two weeks in Freixo in July 2013. I had a good time there, it's a nice place to meet lots of both Portuguese and foreign people. There always are at least some wwoofers, but also many other people who run their own projects over Freixo's land, and others who are on stage. I would have liked to have some knowledge about Portuguese, because official farm workers speak Portuguese only, but I managed to interact with them by signs without any problems.
The spirit of the farm is mostly based on meat production, but they also have lands for vegetables. I worked in this field, mostly weeding and gathering vegetables. The way they cultivate doesn't really follow the principles of permaculture and organic farming, also because it is a big farm and they have a couple of shops to furnish constantly.
Wwoofers are very well treated, there are small houses for them, with beds, hot water, electricity, washing machine, internet...nothing missing. The only thing that I can blame is that food for wwoofers is not from the farm (although they have many many vegetables, they have flour, they could possibly have everything) and it is not even organic (they took it at LIDL).
If you are very interested in learning about organic farming this is not the right place, but it is the right place to meet many different people and especially local people, that are difficult to meet in many other farms, and to test your resistance in working many hours in the sun (in July we worked with the official workers from monday to friday 8-12 13-17).