Our stay was great - this is a good base to use to explore BA and not to far from anything. We arrived around 10pm and the check-in process was very smooth. The location was perfect - in a very safe neighbourhood within walking distance of many attractions and across the street from the subway. Taxis are always available on the main street, only 10 seconds from the front door of the building.
The apartment had most things that we needed, including the washing machine on the balcony that we used a few times. There are lots of small grocery stores nearby if you plan on cooking in the apartment. The common areas of the building are not fancy or overly clean, but the apartment itself is nice (I think this is common for BA apartment buildings). The WiFi is strong and worked perfectly.
If you stay here, definitely check out the café called "Delicious" for breakfast or lunch. It is located just around the corner (turn right out the front door of the building and then turn right at the first corner - it is a few steps up the street on the right). The coffees, meals (particularly the fresh granola) and sweets are fantastic and reasonably priced.