Staying at Krunal and Anita's was a pleasure. Krunal met us at the apartment upon arrival. He explained everything we needed to know for our stay, and also gave us recommendations for sightseeing, food shopping, etc. The view is stunning, and the apartment is steps from many fun shops and restaurants while being just a bit up a quieter street. It has four completely separate bedrooms, which we needed. New, modern fans are provided in each room. They circulate the air well and offer white noise, especially appreciated in the rooms that face the street. The flat also has two bathrooms, which was important with three generations staying in the same apartment! The kitchen / dining area / living area is quite small - really, any kitchen operations need to happen first, and then the dining table should be set and the meal can commence. That was totally fine with us, and the kitchen is fully equipped, with a microwave oven, a stove, an oven and even a dishwasher.
Note that there is no washing machine and dryer either in the apartment or the building, and the nearest laundry is a bit of a distance. In fact, we decided not to go, and instead we washed what we needed to in the bathroom sinks.
Arriving from the airport Krunal advised us correctly to take a taxi. I suggest noting to the driver in advance that you know that c. 12 euros is the right price, and reminding him to put on the taximeter. For the rest of our time, walking and public transportation worked well. Getting around was easy - everywhere is downhill from the apartment, so we walked either all the way to nearer places, or down to several central transport areas and then hopped on trams/buses/trains. The way back we plotted out to either take the tram back up the hill or more frequently walked to the public elevator less than 10 minutes away. This was all fine for the three generations including two fit grandparents in their late 70s and two kids, 10 and 7 years old. The elevator is also where a full supermarket is, so stocking up with food was not a problem (plus, Lisbon restaurants always served us about twice as much as we could eat, so we ate many leftovers!) We would be thrilled to stay at the cozy Castelo apartment again.