A very good solution, I think, would be a Peachtree Audio Deepblue Sky.
https://www.peachtreeaudio.com/deepblue-sky.html
I've bought two of the previous model, the Deepblue 2, for my daughters who have the same requirements as your tenants and you. It's an elegant all-in-one solution with remarkable sound, easy Bluetooth pairing and an auxiliary input for other sources.
My daughters grew up with great sound in the house and are extremely happy with the Deepblue. For them, with little kids around, the lack of knobs or wires is a big advantage. Likely would be the same with your tenants.
Easy to find from online dealers or Peachtree directly for $400.
https://www.peachtreeaudio.com/deepblue-sky.html
I've bought two of the previous model, the Deepblue 2, for my daughters who have the same requirements as your tenants and you. It's an elegant all-in-one solution with remarkable sound, easy Bluetooth pairing and an auxiliary input for other sources.
My daughters grew up with great sound in the house and are extremely happy with the Deepblue. For them, with little kids around, the lack of knobs or wires is a big advantage. Likely would be the same with your tenants.
Easy to find from online dealers or Peachtree directly for $400.