We had a great stay at Daniel's apartment. The communication leading up to our stay and during our stay really was excellent. Daniel and Liam were really considerate hosts. We arrived quite late in the afternoon and had asked them to stock some milk for us, which was waiting in the fridge when we arrived. During our stay we also had a small issue with the WC being blocked and it was resolved the same day.
The apartment is very much as described, with a nice comfy bed which we very much needed after our long days walking around Lisbon. It is a 10 to 15 minute brisk walk to the very centre of the Baixa district. The Rossio train station with trains every 20 - 30 minutes to Sintra is around the same distance. One watch out for anyone going to Sintra, is that the queues for tickets can be very long indeed (we ended up queuing for 45 minutes) and the automated ticket machines only accept Portuguese bank cards and 20 Euro notes or below. It can be easier to get the ticket the evening beforehand.
The final tip we would give to anyone staying in Lisbon who enjoys art, would be to visit the Gulbenkian Museum (https://gulbenkian.pt/museu/en/) which was definitely one of the highlights of our visit. The quality of the exhibits were fantastic and the Rene Lalique collection was genuinely unique.