We are regular clients of the Hipotel Voltaire. The price/quality/location ratio works great for us. It is a no frills hotel, the rooms are very clean, spacious for Paris, and when possible you get an upgraded room. The staff is always nice, helpful and professional. Bathrooms are on the smaller side, but with good hot shower/pressure. Unlike most hotels of that category in Paris they provide an electric kettle with tea bags and instant coffee.