Viale Pietro de Coubertin

The Palazzetto dello sport is located at Viale Pietro de Coubertin

Tram: #2, from Piazzale Flaminio and Piazza Mancini

Train: Metro A line to the Flaminio stop then #2 tram; or the Ferrovia Roma-Nord train to the Piazza Euclide stop

Bus: #10, from Termini Station and Piazza Mancini;

#53, from Piazza Mancini and Piazza San Silvestro;

#217, from Viale XVII Olimpiade and Termini Station; #231, from Piazza Mancini and Piazzale Canestre in Villa Borghese park (weekends only);

Linea "M", special bus route between Termini station and Viale Pietro de Coubertin Auditorium stop

Nearby:

Auditorium Parco della Musica

MAXXI National Museum of 21st Century Arts 

Links:

http://en.wikipedia.org/wiki/Palazzetto_dello_sport

http://www.galinsky.com/buildings/palazzettodellosport/index.htm