The best directions to Taco's bar were given
by Lausannebrit in a previous thread, so I'll repeat them here:
Tacos Bar ... is located in the Flon District. The official address of the building is rue de Genève 17, but the entrance to Tacos Bar is actually at the back, so you need to enter from Rue du Port Franc. The entrance is opposite a snowboard/ski shop called Trend Mania and has a yellow awning that is lit up quite brightly.
If you're trying to find it for the first time, here are some directions:
From the Bel Air bus stop, walk down the stairs that are to the right of FNAC. Go all the way down to the road that is below FNAC (rue de Genève). Cross over at the pedestrian crossing and walk straight ahead. The Ripcurl shop and the Bistrot du Flon will be on your right, a shop called Maniak on your left. At the end, turn right and the entrance to Tacos is immediately on your right.