I can’t recommend a lawyer but I will point that you can also use a solicitador to deal with all paperwork, you can search https://www.osae.pt/en/pesquisas/2/1/1 for one close to your location.
You can check the documentation and see if what you saw on the property matches the documents, and if you find some discrepancies you can then check the Câmara.
You will need to ask to see the «caderneta predial», «certidão predial» and the «licença de habitabilidade» the seller or the agent should have this documents ready as they are need to do the sale. Also ask if they have a «planta do imóvel» that's the drawing submited to the Câmara.
If you do need to go to the câmara I would recommend you use a lawyer or a solicitador as sometimes it’s difficult to deal with them, specially if you don’t know exactly what you need or how to ask for it, the Câmara employees will speak Portuguese, you may encounter one that will speak English but that is not common.