Way to go, John!
My first piece of advice is to ask the contractor whose work you liked if there’s anyone in his network that he’d recommend using after he retires.
Also, I agree with Jonathan’s note about communication – that’s key, especially when your tenant lives right next door. I’d add that your proximity could make it tempting for tenants to walk on over if they need help with something, so giving them clear instructions on how you prefer to be communicated with and what constitutes an emergency will set all of you up for success.
To that end, might I recommend our free Welcome Home Guide? This customizable guide is the perfect place to spell out important information, from how best to reach you to where the emergency water shut-off is.