Looks good from the photos, I'd bob down and have a look just to be sure. I've had my 147 for around 16 months now and if they're looked after they will be reliable motors. Whilst I have a diesel there are a few areas to look out for on the petrol cars.
1. Timing belt/water pump replacement every 36,000 miles.
2. Suspension components/Front upper wishbones can wear causing a creak from behind the dash.
3. Clutches on their way out will bite high, check for slipping in all gears.
4. The Twin Spark engines do use oil, if it's low or shows signs of neglect it's probably best to find a different example.
5. Check all the electrics function properly as this can be an Alfa weak point.
6. Check the panel gaps for damage and/or paint overspray which can conceal a previous accident.
7. The exhaust back boxes tend to rust quite badly, they can look unsightly after a while but are not expensive to replace.
8. Sometimes the gear linkage bushes wear which can cause the 'sticky' gear' feel, although replacement bushes can be bought at your local dealership or Autolusso for around £6.
The AlfaWorkshop link below will clue you in to more areas to look out for with this model.
Alfa Romeo 147 Buyer's Guide
Best of luck if you decide to buy either a 147 or GTV, both are great cars.
147 Sport Q2: Autolusso Remap + Swirl Flap & EGR Delete, Mocal Oil Cooler Kit, JTD Performance FMIC Kit + High Flow Elbow, Wizard Downpipe, PF Pads + 5.1 Fluid, Autolusso Braided Brake Lines, MTech Short-Shifter, Autolusso Silicone Turbo-to-MAF Hose, Refurbed Q2's + Some to add later.