Yeah well - City doesn't work for me compared to Vios. The City isn't cheap to run btw.. for some goddam reason it costs more than the Vios in terms of servicing.
From a Myvi to a Camry.. bro. I don't doubt your driving skill but this will be a learning curve to guestimate the size of the car and park without dings.
Anyway, you've pretty much decided already and just fyi - maintenance costs isn't calculated like that. Take for example my fuel pump assembly, Nissans is RM1400 to buy because of the way the damn car is made. Camrys aren't the same as Vios' and they may have expensive parts and all as well. Talk to your relative and find out the costs of wear and tear parts before confirming your purchase.
To check the car - you need to get your hands dirty. Check the boot corners, lift up the carpets and look at every corner for fiber repair work, check the tyre wheel well for fishtank. If it is, avoid. Check the door sills, under the seat carpets, fenders for removal marks, rust and different colour matchings. Check for overspray paint and if you see overspray - avoid. It's hiding flaws.
Next open front hood, listen to car idling, listen to car in gear - listen for any odd sounds. Your relatives camry can be used for comparison. Then test drive if possible. Slow and pedal off when going over bumps - if it jerks when shifting down don't take the car. Fast and see how it shifts up or handles your accelerator input. Non-cvt won't be smooth but it shouldn't be too violent or make any whiny noises.
Or just pay a mechanic to help check for you.