I actually viewed an apartment in Convent Court a couple of years ago. I'm just going to describe the location (not the property - you can judge for yourself whether it meets your requirements and whether its a good investment - I've seen some of these stay on the market for quite a while before shifting). These apartments were some of the first to appear in Clondalkin village and their size and layout reflect this. They're really more like flats than apartments (Though i'd rather a flat here, than a house in some other areas!)
As far as amenities go, you're going to find it hard to beat the location. Its right beside good primary and secondary schools. Tescos, the Mill Shopping centre, local shops, post office, church (RC) are all really close by. Its close to bus routes (on some of them). Luas is 10 - 20 min walk depending on how fast you walk. Aldi's is currently being rebuilt at Newlands Cross, and there's a Medical Centre there too (about 5 mins walk). Close to Firebrigade (belgard Road), Police Station (Beside the Mill) and Tallaght hospital. Several pubs nearby too (although this can be a good or bad thing depending on your point of view).
The traffic can be a bit heavy in the area, during the school rush/peak times - but it can look worse than it really is.
Safety-wise its not bad. People living in the immediate area would be considered 'respectable', hence properties in St Brigids, New Road, etc can go for very big money. However, Convent Road (as opposed to New Road and Boot Road) is the main route for people from some other areas of Clondalkin going to the village, so I wouldn't be happy for my wife to walk around at night by herself after the pubs close - although she'd be fine 99% of the time if she did - I'm just a worry wort! (And this would go for every locality in ireland, for that matter).
So, to sum up.... I would have seriously considered buying there a few years ago if the apartments had just been a bit bigger - but of course if they had been bigger, then they'd have been out of my price range at the time! Also, I like a bit more greenery around me and there isn't all that much around there as its not an actual estate. There is the community centre a few mins away, and Corkagh Park also, but there's not enough greenery right on the doorstep (if you know what I mean). Very close to amenities and services but a little bit too built up (though there are lots of areas far more so). St Brigids, Newlands Drive are all lovely, mature housing estates nearby and benefit from being a little further away from the village and the main road than Convent Court imo. Its not the most aesthetically attractive area in the village, but it is very convenient.
Overall for the location: 5/10 (although I'm being quite critical and it is very close to areas that i would give a 6 or 7, but also quite close to areas that I would only give a 4). The overall 'attractiveness' is what lets it down a bit imo.
location-wise, to live in I would definitely buy an apartment in Convent Court before Mill Park, or the ones near the Mill (beside Xtra-Vision) or some other areas that you could buy a house or bigger apartment for the same kind of money. Location over size. (Might be a difficult resale though given the over-supply of apartments).
1 bed apartments in Aras na Cluaine are similarly priced - I would buy in covent Court if I had to choose one or the other (a good residents group for Convent Court could spruce the place up quite well if they put their minds to it) - the location is definitely better overall imo.