There's a reason it's called maintenance, it means you have to be constantly checking on things to make sure your rental property stays in tip top condition.
Tenants are legally entitled to a safe and habitable property, but it also makes good business sense - if it's not kept in good repair then your tenants will be few and far between and you will be losing money.
So lets have a look at maintenance.
The Tenant's View
Make sure you keep in mind that other people are going to be living here and you want them to be safe and happy. Happy usually means they will turn into long-term tenants and that's what you want. So look at it from their perspective. What would put someone off? Is the gate hanging on it's hinges? Is the paint peeling? Are there dripping taps? These things don't take too much money to fix, but they have a big impact on what the place looks like and how your tenants feel about the place.