I would skip it. The building was leveled in WW2 and rebuilt in 1950's. Interior lacks original detail. It's room after room of the audit tour telling you about where the furniture was obtained and who designed the cloth upholstering the wall. The exterior was poured concrete faux painted to give the appearance of carved stone.

De acuerdo, las filas no son muy largas. Eso sí, hay que saber la hora de cierre, porque una hora antes no venden boletas. Al menos en invierno....

You don’t have to. You pay on entry and under 18s are free . I think it cost around 7 Euro’s including headphones.

About 2 hours to do it justice

I don't know whether entrance on Sunday is free, but perhaps on special days. The best way to find out is to check the Residenz web site and if necessary, use a translator to get a display in Cyrillic. The courtyard is always free. Certain students and other visitors may be free, but it appears they are mostly German citizens.

La chambre dispose d'une machine à café. Si vous vous référez à un café comme un commerce pour aller boire un verre, le bloc a deux endroits où vous pouvez aller.

during WW2 a great part of the "Residenz" was distroyed it was rebuilt but unfortunatly WITHOUT AC

It is in Max-Joseph Platz. As you face the Residenz, the Opera House will be on your right. There are arched entrances in the middle of the building leading to a small courtyard. Enter there. There are signs for it. The Residenz is huge...something like 130 rooms. If you plan to also see the Treasury, and you should, do the Residenz first, go have lunch nearby and come back after lunch for the Treasury.

Olá! Comprei o ingresso na hora na bilheteria e retirei o áudio guia logo após. Estava bem vazio, pois estive lá no final de fevereiro. Não espere muita coisa, se comparar com outros palácios europeus, pois o local sofreu muitos saques. Sugiro não deixar para ir no fim do dia. Boa viagem e aproveite bastante!