i see the windows and are very press closed ones. floor and walls of cement, just the door of wood. how much ilegal it could be? just a shout from the neighbor right? then i would know when to stop.
people here rent rehearsal rooms to practice music...
CK
Drums and trumpets and trombones are too loud
But if it IS an electric (amplified) guitar, he has to adjust the noise level to a level acceptable for an apartment. It is obvious that the electric guitars were developed in order to compete in loudness to trumpets, trombones and saxophones, but as the father of a schoolfriend, a professional music manager, long ago showed us (the grandmother of my friend was shocked), you can change the sound, you can move the loudness up (Mrs M came rushing in, but retreated) or down.
We for years had a professional piano player in the apartment above, and he was in constant conversations will all the neighbours. Generally we enjoyed his excellent playing, both classic and modern.
Another aspect is how to place things in an apartment. Important is that the walls towards your neighbours are insulated, either by furniture, or wand-carpets. Loudspeakers shoud NOT be on the wall and not on metallic things but on wooden things.
The second husband of the mother of the friend mentioned above was a professional on clarinet and the husband of his godmother a professional on trumpet, clarinet and piano, and they at times exercised in the house of his Grandmum. They found out that the eating-room was well insulated by furniture, looked out into the garden. And also good positions with one window closed the other one open where they could exercise without disturbing people.
Giving them that option by going to see them all personally should stop them calling the police or ganging up to make the landlord hate you.