Had a decent stay at Anna's guesthouse! She was lovely, very easy to reach and always communicative.
Pros: The guesthouse is very well located in the gorgeous Alfama district, around many good landmarks, tourist attractions and restaurants + bars.
Cons: Relative to other guesthouses I've stayed at in Europe over the summer, this one lacked basic amenities like filtered water, coffee or kitchen. Wouldn't recommend unless you're just looking for a quick night's rest.