When I went in April 2019 There are no bag checks and best to arrive 10 minutes before your time slot. You are normally split into groups by languages you speak as they have a guide that speaks the main languages for example Italian, french, German, English etc

As per the previous answers, it appears to be the case that you can purchase tickets online. We didn't and it wasn't crowded at all. You see the entire Opera House except the concert hall, which is being renovated. However, in my opinion, it is well worth seeing still. And, there is a mini performance after the tour, which in itself is worth the price of admission. The Opera House is on the Hop On/Hop Off (Citytours) bus route, so it's very easy to get there if you have a ticket with them. And their tour is worth the price of admission. But note, get started early in the day as the buses stop running at 5 p.m. Although there is a night bus that starts running at 7 I believe. Plus Hop on/off includes a boat ride up around Margaret Island and back.

Mostly mondays are closed for museums

The main opera house will not be open until spring or summer 2020. We were there in May abd our guide said construction is behind schedule. You can tour the main stairs, the buffet lounge, the smoking room, and another hallway now. At the end of the tour, 2 singers will sing short arias and duets. This tour takes about 45 minutes

למיטב ידיעתי רק באולם עצמו. התרשמתי שאין לחץ מיוחד וכנראה ניתן לרכוש ביום ההופעה. אבל אם תרצו על בטוח אז כדאי לעבור יום, יומיים לפני ולרכוש כרטיסים. לא יכול להמליץ על האופרה עצמה מאחר והמקום בשיפוצים, לא עשה חשק להכנס לאופרה.

Да, будет. Реставрация до 2020 или до 2021 года (точно не помню). Поэтому посмотреть интерьеры (кроме зала) можно только на экскурсии. Труппа оперы выступает в театре Erkel.

You could tour the complex, but not the main concert hall. It was still a good tour and you do get a great performance on the grand stairway. We just showed up, bought tickets and joined the very next tour, we didn't have to wait long.

La ópera esta cerrada hasta el 2020, sólo una exhibición de 10 minutos hay y compramos en el lugar.

The auditorium is being renovated as is exterior still can have tour round some areas and some opera singers sing to you afterwards