Pembo, We checked out Stamatis and would happily book there as well, just that with flights so cheap (we fell lucky with EJet), it was worth it.
We got a good deal, really, when you deduct the transfer and air-con cost - it stands up well at Athens Bar Apts., for 2 people.
Compared to lots of other deals, where you have to buy Air-con and Transfers on top.
We met Tom (Stamatis), 3 years ago and he showed us around, they look as good as most Apt's do.
Don't worry about it, you will love it there.
Whenever it's a budget issue, or value for money, the whole thing around booking independently always revolves around sourcing cheap flights.
Cheap flights are the deal breaker for us.
Without that option, it can be much more expensive than a Thomsons package, so we would always weigh things up and then decide what to go for.
As most accommodation is of a similar standard, it can be a no brainer at times.
Exceptions are mainly personal preference, there are an odd few examples of accommodation that is now up in the luxury bracket,
or sited in a particular place that is worth paying extra for,
however, we look at it this way, we only sleep and wash there & always usually eat out.
When you have been before, and you know the place - most apartments will suit there - as you said no real bad ones anyway!