Évora is a hot and dry city (in Summer), and walking around may become hard.
The city centre is prepared to it, hiding most of the small stores under the shade of very convenient and good looking arcades.
This puts people a little out of sight, giving the city a tranquility that... it's real, but not that much.
Évora is easily seen walking, but, in a very hot day, with children or disability, there's the possibility to move around in horse driven carriages.
The tour takes about 30 minutes, and the problem is that it doesn't stop to allow you to see inside the touristy attractions.
Unless you deal it with them, where possible...