Yes, Opera singers seem to enjoy the sound of a Hall.
We worked in a living room in a suburban neighborhood here in town. It's the composers house. It is 1 block from a busy grade school and 3 blocks from a busy interstate. It was 10a.m. so the town was up and running.
The vocal mic was about 4 ft back. It was a Wunder CM7 Fet. I need to keep it back that far for the loud parts and it needs to be able to be turned up quite a bit in the quiet parts.
The piano was half open and close miced with a pair of ribbon mics down near the strings. I stick my head in there and listen for some nice spots.
I added a bit of reverb in post to make the sound seem familiar to the performers and it also helped mask some of the world outside noise when I had to boost the levels in the quiet passages.
It's the kind of thing that seems so simple and when you do it ok it sort of sounds like you just used a tape recorder in a hall some where, but if that's all you did you would end up with a mess of noise in the quiet parts and a pegged out over driven sound in the loud parts. You spend a lot of time hoping you are in a good middle ground. :-)
My main interest is listening to the basic tonality of the vocals and the way that particular piano sings on the high notes, then I just try to stay out of the way.
best regards,
mike