I visited Lisbon several times throughout the last couple of years. Stayed at Miguels place during Corona lock-down and still enjoyed it :)
I'll keep it short:
+ bright outdoor space (sunroom + huge terrace)
+ fully equipped kitchen
+ really good mattress (quality of sleep, no backpain at all)
+ surprisingly spacious bathroom (not common in Lisbon apts)
+ quiet area (local neighborhood, not on a main street)
- ground floor, you might hear people outside in the morning (was not the case during my stay due to low season and city lock-down)
- can be a little cold inside (stayed in March), to be fair there's plenty of portable heaters (actual radiators)
- no washer (several laundry places down the street)
Would definitely recommend this place for couples staying long-term.