Concerts in Vienna

You are a little early for the concert schedule has not come out yet.
Book mark this Summer concert series
http://www.sommernachtskonzert.at/index_en.html

Which Strauss Johann or Richard?

Thank you for the link to the concert series. We are interested in Johan Strauss.

Music by " The Waltz King " is ubiquitous in Vienna as I'm sure you've surmised . Depending on your level of appreciation , this link will provide you some choices . Pay special attention to the link in the bottom left hand corner '' Concerts for newcomers to classical music " . The quality of performance in Vienna is very high due to the large cadre of skilled players , so you are unlikely to be listening to second rate performers . Also , the link " Viennese concert cafes " is worth a look . Café Braunerhof at Stallburgasse just off Michaelerplatz has a piano trio ( violin , cello , and piano ) playing on weekends . https://www.wien.info/en/music-stage-shows/classic

Thank you so much! This is extremely helpful!

You may consult Austria's most comprehensive event directory: https://www.events.at/
It is in German only, but you can easily filter by location (i.e. Wien), date and type (e.g. Musik).
If you want to book tickets online, best is to use the website of the respective venue (and not a ticket office).

Thank you!