This is probably the only reason for visiting Torre Annunziata, but it really is a trip worth making.
The ancient 'Oplontis' was a 'suburb' of Pompeii. Two villas have been excavated, but Villa Poppea is the only one open to the public. Thought to have been owned by Nero's wife, it was later substantially re-modelled by subsequent owners before the eruption of Vesuvius.
Within the villa are the most beautiful wall-paintings. Its size and obvious luxury give a most vivid impression of the wealth and opulent lifestyle of the Roman aristocracy: there is even a massive swimming-pool in (one of) the gardens!
My Torre Annunziata page has more information and many photos of this beautiful and evocative monument. Be warned that at the time of my visit( February 2008) the villa was undergoing a great deal of renovation and restoration, so some rooms were closed or only visible through safety fencing. It's still worth the 5.50 entrance fee!
The graffiti (and the rubbish) in Torre Annunziata may make you feel that your visit to Villa Poppea was ill-advised. It wasn't.
Persevere with your walk, don't feel nervous. The five minutes of unpleasant street scenery will be worth the hour or so of beauty and fascination which awaits you. No doubt the EU-funded works going on during my visit (February 2008) will soon make the approach to the villa a more pleasant experience (though whether the rubbish problem will get sorted out is a different matter!).