Sandra's place is a small, charming house in the Mouraira, which is an up and coming neighborhood, mostly residential, not yet overrun by tourists. Easy walking distance to the Baixa, the Barrio Alto, the Alfama and the Castle district. Impeccably clean. Lovely balcony looking out over rooftops which was a great place for coffee and breakfast.
We had a few problems though. We got in early in the day and Sandra was totally rigid and unhelpful about dropping off luggage in advance of her three o'clock check in. This was made more puzzling when, on our check out day, a nice young couple showed up shortly before we left whom Sandra had allowed to do exactly that kind of convenient drop off.
The house also missed some of the basic amenities that make a trip easier. A bar of soap in the bath would have been nice, or useable dish washing liquid in the kitchen. There was a coffee maker, but it was warped and not easily workable. More than one towel per person for a three or four day stay would have been appreciated. So would a wine or beer bottle opener. The door to the balcony was also broken when we arrived - hanging on one hinge. That got fixed after we reported it to Sandra by text, but we never heard from her about it - or, for that matter, again.
I think our bottom line is that if you're okay with a purely transactional situation - a good place to stay, but not much more, this booking will be fine for you. If you expect a little more attention to the personal details of hosting - and to the presence of the small but basic amenities/conveniences that make a stay easy and completely pleasant, you may want to look elsewhere.