@nolabelle - this is a great idea when, as you said, the artists are members of your family. But when it isn’t then you can get yourself into a pickle with insurance and so on. If an artwork is damaged, who is responsible? When an artist is exhibiting at a gallery, generally the gallery deals with insurance issues so the artist often doesn’t have a history with an insurance company for covering his/her artwork.
If the artist has his/her artwork in your rental without their own insurance, then you’ll end up being resposible.
For modern artwork, cheat. As long as the frames are decent and they also have a good-sized mat, you can really have fun with framing all sorts of things. I can see right now in my own house two artworks that look like expensive modern art - they are actually modern-design wrapping paper, of all things. (No-one has ever realised).
As long as the frames are decent, travel posters, particularly ones from the thirties and forties, can look fantastic if your rental is in a tourist area. Black and white photography can look particularly good.