Sometimes pictures deceive but Magda and Diogo's apartment is really as nice as it looks in the photo on the website. Both the bathroom and the kitchen are extremely well fitted out, so if you are planning on a longer stay and want to cook, do laundry etc it's all there and the bed, linen and towels were all great. Both of them were extremely prompt in getting back to us when we booked, provided a map to show the best pedestrian route to get to the apartment (although as noted below if you have cases it would be easier to take the 737 bus, or a taxi - about €4 from Rossio), and they were there to give us a very warm welcome at the apartment when we got there and very generous with their advice.
The situation is great in a little back street of the Castello still largely inhabited by locals, so although the Castello is a major tourist draw crowds passing the front door were not a problem (although we were staying in low season) and of course at the start and end of the day it is quiet. For seeing Lisbon it is also well placed: walk in one direction and your are straight into the the winding streets of Alfama and in another you are in the bustle of Rossio within 10 minutes or so. It is a steep walk up to the Castelo but the 737 bus from Praca Figueira is a frequent alternative which drops you off at the Castelo entrance. There are two nice bars, one at each end of the street but I would give the restaurant O Guerriro (sic) on the way down to the Castelo itself a miss.
We would definitely consider staying there again.