Most of my clients want me to clean their kitchens, bathrooms, and then do a thorough dust and hoover. Some have special requests like cleaning out the inside of the fridge. I will usually do some things on a sort of as-needed rota, like cleaning inside the fridge or wiping out the oven (I don't clean really dirty ovens, but I will maintain a clean oven.)
I am never asked to iron, but I know it's something a lot of people want. I'm not sure why I'm never asked as it seems to be a very popular thing based on what I read here. Perhaps because nothing about my web site mentions ironing - I prefer to avoid it. Some cleaners are happy to iron and some aren't. You just have to ask.
Some cleaners won't make beds (or so I hear) but some will (I do.) Some cleaners are more about cleaning while others are more about doing basic domestic chores.
Some cleaners charge by the hour (the ones who will iron and do whatever you want will do this) and others charge by the job (they tend to be more focused on making dirty surfaces clean). It really just varies.
I will say that most cleaners want you to have tidied somewhat for them to be able to clean. Some people find the incentive to run around tidying helpful and some people seem to resent the very idea of it. There are cleaners who will happily put away all the clutter strewn about, though.
I'm not very helpful, am I? 
Think of the things you hate doing, and give some thought to which things you'd like to have done once a week (or however often you want help.) I'm not sure if it's a matter of saving time or a matter of things getting done that people might put off/not get around to.