Incredible bargain in a great location. Understand other reviews which said it was a little noisy - but that's what you get for staying in the heart of St Germain des Pres for that price!
Ideal for our weekend in Paris but don't think I would stay there in high summer as it was very warm and with the windows open the heat and the noise of the street would've made it pretty hard to sleep. We were on the main corner room suite though so had additional windows. There might be interior rooms that are cooler/quieter.