Hi Evi3, Built up deckings, raised plant beds on patios etc in the hope of some privacy have often ended up causing the opposite of what you want to happen. I know people who not only are out of communication with their next door neighbours but hope that they will evaporate somehow because of garden "privacy" issues.
A hedge will probably solve your problem, but hedges are not easy to maintain especially as you get older. Then there is the issue of whom will maintain the other side of the hedge.
I know I am not resolving your issues but my advice to you especially if you are living in a housing estate is to tred carefully as a good neighbour is a rarity and an invaluable asset into the future.