La Bunga is a little outside the tourist-rich crowds of the Mariscal district and is a favorite of locals, mostly college age and 20-something Ecuadorians. The entrance isn't really marked, but if you're coming up from Mariscal, it's a white stuccoed wall on the left one block before 12 de Octubre, and you'll see people hanging around the door.
Inside, the music consists largely of new wave rock, especially Spanish-language groups like Soda Stereo, Los Fabulosos Cadillacs, and Molotov, with some Bob Marley and Cure mixed in. The crowd is fun but "tranquilo"--not too wild (though sometimes known to get a little crazy on Molotov songs), and not likely to bother the women! There's usually plenty of people but enought room to move.
La Bunga does have a pool table, but no cue ball - most come for the dancing. There is also a decent selection of liquor at reasonable prices.
Saturday night seems to be the big night here, open till 3:30ish. Guarded street parking is available, though you'll probably need to tip the guard a dollar.
(The street Fco. Salazar is squeezed between Cordero and Colon - from Plaza Artigas, it's the first right off of Av. 12 de Octubre)