very nice apartment, nice surroundings, lot of options for having great food, or buy some stuff at one of the supermarkets.
conveniently connected by various buslines, train station (cais do sodré to cascais, within a 10 min walk), even an "elettrico" to wherever you want to go in the lisbon area. at the same time, you can explore ajuda by walking, e.g. to the oldest botanic garden in lisbon, or the palacio nacional de ajuda (a very impressive building).
for the two of us the apartment had ample space, for four people (as the number of beds suggest) it might be a bit of a challenge.
and finally, francisco the host is very (!) responsive to any kind of needs you might have and that he can solve within a few hours.