The location is great, you are right in the middle of the city. Loads of (smaller) supermarkets around, and loads of bars, restaurants, and breakfast places.
The apartment itself was great, a big comfy bed, modern bathroom, lovely kitchen with loads of utensils. We visited Lisbon in february, some nights we could hear some drunk/celebrating people outside, but that's because there was a holiday. We barely heard any noise from the surrounding apartments and I definitely could rest well during the nights. Also, the price, at least when we booked was very very friendly, especially for a modern and roomy apartment.
Two things I'd change if I had the chance: I received a lot of messages from Altido, but a lot of them had the exact same information or message. I think I got around 5 messages mentioning where to pick up the key. Helpful, but in total I received 15 messages, and that doesn't seem necessary. Lastly: the couch cover.. Stains in every tone of brown. Still, highly recommended!!