Our first apartment in Paris, 16 R. St-Severin, was right across the street from this lovely little church.  17 R. St-Severin is about two blocks away.  The only explanation we can think of is that the houses were numbered in the order they were built(?)
While we were staying there, the Youth Orchestra of San Antonio (TX) played an evening concert at the church as part of their European tour.
To see some of the church's stained glass, click here.