We stayed at Porto's for a day and everything was super nice. The room is clean, big and fits the photos, with beautiful furniture. Hosts were very nice and attentive for us.
The rooms is located on the ground floor (for us it was a plus), but windows are pretty high because the house stays on a hill. Definetely worth its money.
Located in historical center, it's pretty quite (but of course you will hear mosques everywhere) but at the same time you can easily find good restaurants just around the corner. It took us around 10-15 minutes to walk to Sofia, but be ready that you will have to go up, and sometimes the road is quite steep! It's not an issue for young, but might be important for elder persons - I was with my grandmother and she got tired.