We stayed in the flat during October half term with teenage boys (age 16 & 14) and there was plenty of room for the four of us. The flat is close to two Pingo Duce supermarkets & has a good selection of cooking utensils so you can eat in if you want. It is about 5 mins to Rossio train station, so easy for day trips to Sintra. There are many tram / bus stops nearby which is useful if you have a Lisboa card. Just worth noting that the lift is FREE with a Lisboa card (we didn't know this as it wasn't listed on the card attractions). Highly recommend going to the Castle of St George early (pre-book online the night before) as the view is much better than going up the lift as when we were there the top platform was shut for renovations.