This was our second visit to Le Relais St. Germain, and our experience was every bit as good as it had been during our first visit four years ago. The staff members try to connect with all their visitors, so after a couple of days (we stayed for four), they will remember preferences and ask about your travels. They can handle English and French that has suffered from many years of disuse. It's nice to be in a place where, if your French is rusty, there is not an immediate switch to English.
Of course a major benefit to staying at Le Relais Saint Germain is the preferred guest access to Le Comptoir, the wonderful paired bistro, whose popularity is underlined by the ever present lines of folks who are not hotel guests waiting for access. Breakfast at Le Comptoir was simple (croissant, cheese, ham, coffee, juice, fruit, and egg) but excellent. We never took advantage of the in-room service because we enjoyed the morning atmosphere at the restaurant.
Our room faced the street (Carrefour de l'Odeon), and although there was a lot of activity until 11:30 or so, it was quiet thereafter until a couple of hours after dawn. The neighborhood is a wonderful slice of Paris.