Sarah and Pedro's place is located in the Alfama district which is walking distance to a lot of the tourist attractions. There's a market right next door where you can buy whatever you need (although the prices are a bit high), and a few restaurants next to you. One caveat is that there's a restaurant right next to the apartment and sometimes they'll put in a table literally in front of the apartment entrance so if you plan to go out or come back at night just be wary of that - it can get awkward sometimes.
The unit itself is quirky. The layout is very interesting and I think there are some things that need to be taken care of considering it's an older unit. First, the bathroom and bedroom doors don't shut all the way - not a big deal since chances are you're staying alone or with your SO in this unit. Second, the laundry door was broken so we had to improvise on how to open the door (used the keychain loop). This was quite unfortunate but Sarah and Pedro mentioned the previous guest broke it so I'll let it pass. Other than that, make sure you heed everyone's warnings when it comes to the steepness of the stairs. You're walking up three flights of stairs - the last one being super steep and narrow.
The unit had everything that we needed sans shampoo and handsoap but we had some so not a big deal.
Sarah and Pedro are very nice that's why I gave them 5 stars. The place itself is very quirky and there are some things that need to be fixed, just watch out for those and you'll be fine