Toledo is a relatively small town, and so is rather safe. Toledo's medieval streets are labyrinthine, so the biggest danger is getting lost, especially at night.
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Due to the location of Toledo upon the top of a hill, the city is exposed to quite a bit of sunshine in comparison to Madrid. Therefore the average temperature you sense may be considerably higher than what you would expect from the forecast. Temperatures can be in the high 30´s 100F as late as nine in the evening. Be sure to bring plenty of water or get some refreshments in Toledo to support the local shopkeepers. Do not forget to put on sufficient sunblock on a hot summer day or try to stay in the shades of buildings and trees.
The historic center of Toledo is rather steep and hilly and most streets are cobblestone, so sensible shoes are a must.