We had a great stay in Lisbon with our two kids (7 and 9). This apartment is in a great location to explore the city with the centre being walkable with kids no problem. Communication was great and really easy to check in.
The apartment was well appointed and the TV had Netflix. The gym is 'ok' and the pool would be really nice in summer I'm sure (a little cold in winter obviously although my kids did try it out!).
Overall I would recommend for a short stay in Lisbon!