Aston's ranking did drop a bit around a year or so ago (I'm not sure why) but with the introduction of the new aston medical school, it has risen again. I'd personally take ranking with a pinch of salt as they always change a bit - so don't worry about this. Aston is still a good university - yes it's not an Oxbridge or an imperial/Ucl, but student satisfaction seems to be quite good and personally, I'd like to be happy at a place I'm going to be studying at (especially if you're move out, like I did). Aston is also renown for its business school too.
Aston places a lot of emphasis on doing a placement - but it's down to you to do the applications, seek help and apply for them yourselves (the uni will not 'give you' a placement, unless it's for medicine ofc). It's quite tough sometimes to find one, but as you go through uni, you'll automatically develop your time management abilities to balance out assignments, societies, job applications etc.
careers and placement are very helpful - but you need to know what you want to get from them and seek the help yourself. Having never wrote a professional Cv/ cover letter before and even sat a psychometric test - the careers and placement team ran various sessions to help students with these + other areas.
I'd be careful with the 'good reputation for employers'. A lot of the time, it's you as a candidate and your experiences that will be the deal breaker during interviews, not the uni you go to. Unless it's something very competitive such as investment banking, the uni you go to doesn't make a difference during the hiring process. Also as a heads up, with the business school at Aston with sandwich courses, you will be expected to find and complete a placement year. if you do not find a placement, you will automatically be placed into a gap year till you find one. That's what I've heard - phone the admissions team to clarify this (or if u want more info) but as often is the case, they won't tell you all the fine details during an open day