Pros: Martin's place is ideal for city dwellers because you have everything Lisbon offers right at your doorstep. Should you need public transport, you are very well connected. There are several bus stops, metro and overground trains available.
Cons: Because space is limited and the streets are steep, I advise traveling lightly. Watch out - there isn't an elevator in the building, so you won't have fun with a large suitcase. Other than that it's a small, cozy place. If you are active and want to work out, you should better go outside, as space is limited.