I went to Sziget Festival for the first time on my own as a single female in 2019, hoping to just do my own thing and meet people there. I left Sziget knowing I'd be going back every year for the rest of my life! It's truly a unique festival from the location to the people. It's called the Island of Freedom and it really does fit the name.
The food was decently priced (in comparison to the Spanish and UK festivals I've been to, Sziget was better priced) - pricey for Budapest but cheap for a festival.
You can't take alcohol in with you however the drinks prices are relatively well priced with only spirits being a bit too expensive. (But still, in comparison to my other festival experience - still cheaper than average) A lot of people just got into the habit of buying alcohol from the big supermarket nearby and drinking on the grass outside the store to bypass the Sziget prices.
The lineup was star studded in 2019 with massive names playing such as Ed Sheeran, The 1975, Franz Ferdinand, Florence and the Machine, Martin Garrix, Macklemore, and others. The stage was easily seen from quite a ways back (I didn't find it necessary to stand on my toes!), with large screens to help with that too.
There is so much else to do at Sziget in addition to just the music, art, yoga, sport, swimming, boat parties, relaxing on the beach, dancing, a circus, and so much more.
One word of warning, due to the dust and mixing with lots of people you are quite likely to get ill after the festival - so book some recovery time for after the festival!