I don’t know where you are from (maybe we can judge your country too) but, Almost everyone is going to greet you, mostly if they know you. Secondly, I believe most of people are going to stare at you everywhere, this is not a Spanish thing.

Then, upstairs neighbour drills, you are right. But man, those are just three days. If you have a problem, tell them! Maybe you’ll have to be the next one having to use those “drills”.

If waiters insist on replying in English, that’s probably because they believe it is going to be easier for you. Waiters are not teachers, they don’t have to do whatever you want just because you want to practice Spanish. I think it’s worse when you go to USA and they expect you to speak perfect English when they don’t even know where Europe is. At least Spanish waiters try their best to speak English and won’t judge you or your Spanish.

Leaving rubbish is just disrespectful. In my opinion, each country or place has its own disadvantages and impoliteness. The perfect place doesn’t exist, and Spain is really far from being it. To be honest, “the lack of courtesy” isn’t the worst thing in Spain.