Hi all! Sorry for taking this long to reply.
First of all, the city council (Câmara Municipal) ended up delivering to my house a huge composting bin (I looked it up and it costed 50€) for free. I have been putting kitchen waste, fava beans and grass, but I still need to find some brown stuff to put in so it evens things out. I'm going to go around when I have time to "steal" my neighbors pruning waste. I gotta tell my family to also put the coffee grounds in the compost bin.
Velho Barbudo, my garden is located towards the sea, so it's South looking. We have a problem from the air of the sea killing some plants which I think don't deal very well with the salt, is that it? Also something that started bugging us is the fact that we have hares (lebres) coming into our garden. At first it was fine, my dad left a bucket of water for them. But now they have found that they have a vegetable garden with lettuces (they ate the 20 I planted) and chards! This morning I went to check my tomatoes and I caught them on the beds I made. They ate some onions which I found surprising. My dad put a 1m something height plastic net with 1.5cm holes, and the next day there was a hole on the bottom (some mouse or the hares did it, I believe), and they ate away the top of some peppers and eggplant :'-(. We're gonna have to get a metal net that they can't bite into.
Has anyone tried to grow plants that hares or rabbits don't like? Or is the net the only option I have?
Apart from that, I ended up finding some pure Neem oil, it had to be from Amazon unfortunately. I looked up a few Portuguese stores and they only had processed Neem oil, so it was a 3% concentration instead of pure, and they were much more expensive (8€ for 125mL). The one I found was 1L for 15€, so it had to do.
If anyone lives in Lisbon and is interested in checking out my university's permaculture project, it's called HortaFCUL and we gather on Wednesdays to work. It's a project that was started 9 years ago by students who were into sustainability and agriculture, and they transformed a grass lawn into a beautiful vegetable garden, with a lake and a few swales. Then two years ago, some PhD students started working with us and they were given 1.5 greenhouses and 8 plots to do their thesis. One of them is going to be printed soon, and the other one is still being worked on. Anyways, two years forward we have an abundant garden, with another lake that is part of a thought out water retention structure. We started working with the university, taking the kitchen and coffee shops waste (coffee grounds and vegetable scraps). They ended up saving money because they don't have to pay the school's gardeners to take the leaves, grass and branches to another place to be put away. We have a couple of vermicompost bins and a large composter that since September has made 12 tons of compost. So look us up on Facebook and shoot us a message if you're interested in seeing what's growing here.
Thank you everyone for the kind replies and suggestions :-)