Reasonably priced restaurants near the Opera House how much for a meal

All restaurants accept credit cards.

"Reasonably priced"? LOL, today or 5 years ago???
Restaurants are less expensive here than in the UK.

I will send you a Private Message wiht a link to a list of cheaper eats in that area of town.

Your hotel is in District VI, so when ever districts are discussed that will help you. But you are only a few blocks from District VII so restaurants there are an option. I sent you a link to a list. Go to the restaurant websites and check the prices.

annemargaret, YES! And Szek is an anomaly on Andrassy ut. Great prices, especially at lunch. Great atmosphere and very, very good food.

DISTRICT V
Belvárosi Disznótoros https://belvarosidisznotoros.hu/
Kisharang Étkezde https://kisharang.hu/
Városház kifőzde https://www.facebook.com/p/
DISTRICT VI
Csirke Csibész http://csirkecsibesz.hu/
Pinczi hús-hentesáru bolt https://www.facebook.com/PincziHus/
Bográcsgulyás terasz / Kessel Gulyás Garden (I had lunch here yesterday and thought the prices were good) https://maps.app.goo.gl/SuvRgEyN5MTti3jQ9
Regős Restaurant https://regosvendeglo.hu/ (good fixed lunch prices …. Been a while since my last visit, but was well priced about a year ago. Thanks for the reminder, I liked it).

DISTRICT VII
Belvárosi Disznótoros https://belvarosidisznotoros.hu/
Frici Papa Kifőzdéje https://www.fricipapa.hu/?lang=en
Kívánság Étkezde https://www.facebook.com/KivansagEtkezde/
DISTRICT VIII
Öcsi étkezde https://ocsietkezde.hu/ https://maps.app.goo.gl/H2343kkWfzm14S6p8

For a sweet breakfast or a treat I can highly recommend the Strudel Garden Cafe and Bakery at Hajos u. 24. It's quute close to the back side of the Opera House. They have seating, but I just stopped in for a carryout strudel every day. I don't remember the cost in forint, but last year it amounted to less than $3 US--maybe closer to $2.

I tried many different types of their strudel; all were excellent. Offerings vary--they have dozens of types in their repertoire, but maybe only 10-15 on any given day. However, I'm nearly certain they always have apple strudel.

I saw people with coffee cups but never looked at the menu to see what was on offer beyond the wonderful strudel.

Part of the problem in helpig is what is "reasonable price"? And what do you expect for it.

acraven's suggestion is excellent. An Americano coffee will cost you a tad more than 1£ and a piece of strudle will cost you about twice that. Is that reasonable?

At Regős Vendéglő or Szek a three course lunch will cost about 7.50£, but they both have a cheaper 2 course fixed price. Reasonable? No idea.

At Bográcsgulyás terasz / Kessel Gulyás Garden you can get out for about 10£, but you might be fortunate enough to be able to enjoy the live music on the patio. So 7.50£ for food and 2.50£ for entertainment.

AND, Ferdinánd Monarchia Étterem has 2 and 3 course lunch menus for a little less than those above. https://ferdi.hu/

Here's a post listing her restaurants in Budapest with comments. https://community.ricksteves.com/travel-forum/hungary/restaurants-in-budapest-revisited

I stopped in at Cork Breakfast and Wine for a late dinner after attending a performance at the opera house. They were quite accommodating considering the late hour. Don't let the name put you off - much more than breakfast on the menu.

And owned by some great Ukrainian kids ... which explains some of the menu options. They have some tables with a remarkable night time view of the Basilica.

Sorry. But you guys keep hitting on my favorites.