I have an adress near Valparaiso, near the central bus station. Well it is not that type of room you asked for, but since until now there is no other reply to your question I write you this adress:
Viña del Mar
GPS-coordinates: S33°01,185 W71°32,808
it is a little Hostal, cheap and leaded by a family. the bikes you can store safely just a road fruther in a garded garage of the rodoviaria (Parada de Autobus) I am not sure anymore about the price: maybe 3000Pesos/ 2 Motos per 2 night?
Just to make it easyer to find the hostal: In case you stand in front of the house (Parada de autobus) with the house in your back: Turn right and head to the next corner, turn again right into the little road, follow the road to the next corner (50m) and turn again right. Now you are already in the mentioned road, where you will find the hostal. It is on the left hand side of that road and I believe it is a green house. But ask the people around.
Anyway, in Vina del Mar near the coast there is a huge hotel and it is certainly very luxurious but maybe also very expensive. There are a lot of hotels, just head along the coast.
have a nice trip and enjoy it!