Porto is such a lovely city! The tour I had with Catarina was amazing. She's got such a vibrant personality and is really passionate about the city! I would recommend this your if you're visiting Porto!
If you mean you are chair bound, I would not recommend this tour. There are small steps and a lot of distance covered. When I was on the tour, the in-city road rallye created all kinds of diversions.
Probably best to see if they can do a private tour just for you and your group.
Hola! nosotros lo hicimos ayer martes dia 25 julio y fue estupendo, muy recomendable!! sólo debes acudir a la estatua ecuestre que está frente al hotel intercontinental en la Avenida de los Aliados a las 10:00