Hi timothysolberg,
Oh cool! Perfect for a hot day after a long walk, hehe ;)
Hi S.Karry,
In hindsight, I think maybe research which area you want to stay in first (which arrondissement - the closest to where the things you're interested in are), then you can narrow down your searching a LOT.
The B&B we found is in Montparnasse (14e), and is about 80 euros a night (a very basic double room, with private bathroom, breakfast included). There's a really good website here, which is where we found our place, that has tonnes of B&Bs listed (I think it's an agency). You can also search by area, which I found handy: http://www.bed-and-breakfast-in-paris.com/Dicillin.php? .
This one was also on our list, Hotel de Lille Pelican (in 1er), and came well rated : http://hotels.france-bookings.com/hotel/fr/hoteldelille.html?label=gg_en_bh_230223-france-paris-hotel-de-lille&ef_id=1511:3:s_c48722b079523fb2c3e587c97050ed67_788682077:dVtKv9B6MjYAADyCP6wAAAAK:20080203020641
Also there are these in Marais (3e), that have good recommendations on several sites, which are more hostel style places (three in Paris), but we were turned off by the fact they have a curfew between 1am and 7am: www.mije.com
In Montmartre (9e) there are a few decent sounding hostels also:
www.villagehostel.fr
www.woodstock.fr
Hope this helps - I have more if you need them ;)
Edited by: munkitots