If you have a limited budget and need a place to stay in Paris, I would advise you to stay at Gerard's. He's a friendly person who clearly does his best to host his guests properly. The neighbourhood is the contrary of posh, but (I know Paris well) you are less likely to get bothered by people in the streets there than in other neighbourhoods. Unlike what it seems at first... His appartment is conviniently located just in front of the metro entrance. The room he rents is spacious and clean, as the rest of the appartment and the whole building. Gerard also offers some breakfast, which is nice.