The apartment is very nice. I liked the unusual appearance of it, as well as the details. In the apartment is a flyer with things you should visit (sightseeing, drinking, eating etc) and spots nearby (supermarket). From the apartment, you can reach everything by foot and spend your time exploring the streets. It's near to one of the nightlife streets in Porto. If you are into night life, it's perfect for you. If not, consider taking something with you to reduce the noise you can hear (like Ohropax or any other ear protecter), because the party people can be really loud the whole night.
Tomas himself always responded quickly and took care of requests. I didn't meet him in person, since I was only short time in Porto, but he seems to be a nice host.