There is recovery from the anaesthetic and wound recovery. The first part can take up to a couple of weeks (though I have had surgery where I felt fine the next day), the second part can take much longer and can restrict what you can do - some movements may hurt more than others.
I just had half my thyroid removed which was a fairly simple operation: I was in theatre for about an hour, and went home that same day. That was on Monday, on Tuesday I was still recovering from the anti nausea drug they gave me (I had every side effect in the book, and one of these is low blood pressure so I felt quite light headed). On Thursday I had my first 2x20 min walk outside the house, feeling a bit wobbly. On Friday I walked a bit further and later cycled into town, and afterwards I was quite tired.
On Sunday I felt more or less normal again, and after that my activities were just limited by how the wound in my neck was healing. For example, I did jog a bit on the next Tuesday evening (I wasn't going for a run, just needed to get somewhere and thought I'd try and see how it felt to speed up a bit), and the swelling in my neck was uncomfortable when bouncing up and down, while I was fine walking fast. And we left for a 2 week holiday hillwalking with a pack just 18 days after the surgery and I didn't have any problems with fitness. But this can take longer depending on your surgery.
Maybe you can walk before you can run again, or cycle, or something else that keeps you active without hurting the wound? If you walk at the times you would normally run you keep the habit of getting out and doing something.
As a tenant I always appreciated it if the landlord let me know informally with plenty of warning. In those cases I was on short term rentals (can't remember what the legal term was exactly, and this was in Scotland, but basically I had a 6 month contract that could be renewed). The first time the owner decided to sell the house, the second time the owner came back from work abroad to live in the house.
Depends also on what sort of terms you are with the tenants I suppose. Letting them know to expect the letter gives them more time to get used to the idea, and they may find another place in the meantime so leave without trouble.
Grill some veg (courgettes, peppers, red onions, aubergine. whatever) and mix with lots of herbs through couscous, add some oil and lemon juice. Couscous itself takes no cooking, just mix with hot veg stock and let stand for 5 minutes.