How reliable is a toyota aygo?

These semi-auto gearboxes never usually last terribly long but in something like an Aygo it's probably not an issue. It's not the sort of car you'd be racking up 100k miles in anyway.

The aygo is a shared platform between 3 companies

the same underpinnings are also in the citroen c1 and the peugeot 107

all 3 are reliable and economical vehicles as far as i know, they were rated some of the lowest broken down vehicles (which means they are very reliable)

all of the models from 2005-2009 were recalled, not inculding the manual gearboxes, so if you are looking at a 2005 to 2009 model with the auto (or semi auto) then keep that in mind, as sometimes that can lower value, but not usually

If it is the right price, i would certainly consider it as a great option

Well its a Toyota so it should be very reliable.