The apartment is not big but not small.
There are stairs up to it.

It is in the middle of the Bairro Alto area.
There are a lot of restaurants, bars and live music, including Fado, down the street.

The apartment is not too noisy.
The bedroom is away from the street.
I had earplugs.
I had more noise problems in the morning (when the earplugs fall out) than at night.

Public transport is available nearby.
There is a direct bus route to Cais do Sodre, which has a Metro Station.
All the Night Buses leave from Cais Do Sodre, and one comes close to the apartment.
If you go down the nearby Gloria escalator you are at the Restauradores Metro.
Hopefully you will never have to order a taxi on a Saturday night! The streets are full of people at night and driving around Bairro Alto does not look easy.

The internet was very good.
The host is upstairs if there are any problems.
Communications were good.

I traveled alone to Lisbon in March 2015.
The only problem I had was that the washing machine didnt work.